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Strategy
How Greek brands should measure influencer marketing ROI: attribution models, the metrics that actually matter, and why reach alone is never enough.
Greek brands spend on influencer marketing, then report on it using the wrong numbers. Followers, likes, impressions. These metrics describe what happened. They do not describe what the spend produced. A campaign that reached 2 million people and generated 80,000 likes can still be a failed campaign if it moved zero business outcomes.
This guide covers how to measure influencer marketing ROI in the Greek market: the metric hierarchy, the attribution models that actually work, benchmarks for cost efficiency, and how we report on campaigns. The scope of what we run is on our services page, and real numbers from past campaigns are in our case studies with results.
Not all metrics are equal. We organize measurement into four tiers, and the tier you report on should match the question you are answering.
Tier 1: Reach and engagement. The baseline. How many people saw the content and how many interacted with it. Necessary but insufficient. This tier answers "did the campaign happen" not "did it work." If your reporting stops here, you cannot defend the spend to a CFO.
Tier 2: CPE and CPM. Cost efficiency. Cost per engagement and cost per thousand impressions. These metrics let you compare creators and campaigns on a normalized basis. A €5,000 creator post that generated 25,000 engagements cost €0.20 CPE. A €15,000 creator post that generated 40,000 engagements cost €0.375 CPE. The first is more efficient. This tier answers "did we get fair value for the spend."
Tier 3: Click-through and conversion. Business impact. How many people clicked through to your site, and how many of those converted. This is where influencer marketing starts proving ROI. It requires UTM tracking, dedicated landing pages, or promo codes. This tier answers "did the campaign drive action."
Tier 4: Brand lift studies. True ROI. Controlled studies measuring changes in brand awareness, consideration, and purchase intent among exposed versus unexposed audiences. This is the only tier that captures the brand-building value of creator marketing that does not convert immediately. It costs more to run but it is the only honest answer to "what did this campaign produce for the brand long-term."
Most Greek brands report on Tier 1. Some report on Tier 2. Few measure Tier 3 properly. Almost none run Tier 4. The brands that win on creator ROI measure across all four, and they weight the higher tiers when making budget decisions.
Attribution is the mechanism that connects a creator post to a business outcome. Three models cover the majority of Greek campaigns, and they work best when used in combination.
UTM tracking. Every link a creator shares gets a unique UTM string. The traffic lands in your analytics platform tagged by creator, platform, and campaign. This is the baseline attribution mechanism. It captures click-through and lets you compare creators on traffic quality, not just volume. The failure mode is creators refusing to use UTMs because they look ugly. Solution: use short links or branded domains. The data is worth the friction.
Promo codes. A creator-specific discount code attributed to every sale that uses it. This is the cleanest attribution mechanism because it ties directly to revenue. A creator whose code generates €40,000 in sales at 8% margin produced €3,200 in gross profit. Compare that to their fee and you have ROI. Promo codes also extend attribution beyond the click window, capturing customers who saw the post, did not click, but returned later and typed the code in.
Post-purchase surveys. A one-question survey on the order confirmation page: "How did you hear about us?" with creator names as options. This captures attribution that UTMs and promo codes miss, particularly for brand-building campaigns where the path from exposure to purchase is indirect. We run these on every campaign where the brand's checkout supports it, and the lift-attribution numbers are consistently higher than click-based attribution alone.
Use all three. Each captures a different slice of the truth. Relying on one gives you a partial picture and under-credits the channel.
Cost per engagement benchmarks from our 2025-2026 campaign data, by platform and creator tier:
Anything above €1.50 CPE on Instagram needs justification beyond raw reach. A €2.00 CPE creator is only worth it if their audience is uniquely valuable or their content quality drives outsized Tier 3 outcomes. If the justification is "they have a lot of followers," you are overpaying.
Follower count and likes are called vanity metrics for a reason. They measure audience size and surface reaction. They do not measure intent, consideration, or purchase. The correlation between follower count and business outcome is weak once you control for engagement quality, and engagement quality is exactly what follower count does not capture.
A creator with 500K followers and 30K likes per post can drive zero clicks to your site if their audience is passive or their content does not motivate action. A creator with 40K followers and 2,000 likes can drive hundreds of clicks and real conversions if their audience is engaged and their recommendation carries weight. We have run campaigns where the smaller creator outperformed the larger one by 8x on conversion at a quarter of the cost.
The fix is to stop reporting follower count and likes as success metrics. Report them as context. Report CPE, click-through, conversion, and survey-attributed revenue as outcomes. The vanity metrics stay in the deck for stakeholders who need them. The outcome metrics drive the decisions.
Every campaign we run reports across all four tiers. Tier 1 and Tier 2 are standard deliverables. Tier 3 requires UTM tracking and promo codes, which we set up as part of campaign build unless the brand's infrastructure prevents it. Tier 4 brand lift studies are run for campaigns above a defined spend threshold, because the methodology requires sufficient sample size to produce statistically meaningful results.
The point of four-tier reporting is that it lets the brand make decisions at the right altitude. Tier 1 tells you whether the creative worked. Tier 2 tells you whether the spend was efficient. Tier 3 tells you whether the campaign drove business. Tier 4 tells you whether the brand grew. Decisions about creator selection happen at Tier 2 and Tier 3. Decisions about budget allocation across channels happen at Tier 3 and Tier 4. Decisions about whether to do influencer marketing at all happen at Tier 4.
If your current reporting stops at Tier 1, you are not measuring ROI. You are measuring activity. The brands that grow their creator budgets year over year are the ones that can show Tier 3 and Tier 4 outcomes to the people who approve the budgets. If you want to see what four-tier reporting looks like applied to your category, discuss measurement with us.
About Mavericks
Mavericks is Greece's leading creator and influencer talent agency. 27 exclusive creators, 15.5M+ combined reach, 160+ brand campaigns delivered, 94% brand repeat rate. Every campaign reports across four measurement tiers. Contact: info@mavericks.gr.
01 FAQ
Reach and engagement are tier-one metrics and do not measure ROI. Cost-per-engagement (CPE), click-through rate, conversion rate, and post-purchase survey attribution do. True ROI requires tying creator-driven traffic to revenue through UTM tracking, promo codes, or survey questions asking how customers heard about the brand.
Greek market CPE benchmarks: Instagram €0.15-0.40 for micro creators, €0.40-0.80 for mid-tier, €0.80-1.50 for featured. TikTok runs 30-50% lower due to higher engagement. YouTube CPE is higher per interaction but drives stronger downstream conversion. Anything above €1.50 CPE on Instagram needs justification beyond reach.
Followers and likes are vanity metrics because they measure audience size and surface reaction, not intent or action. A creator with 500K followers and 30K likes per post can drive zero clicks to your site. A creator with 40K followers and 2,000 likes can drive hundreds of clicks and real conversions. The correlation between follower count and business outcome is weak once you control for engagement quality.
We report across four tiers: reach and engagement (baseline), CPE and CPM (cost efficiency), click-through and conversion (business impact), and post-purchase survey attribution (true ROI). Every campaign includes UTM tracking and promo codes where applicable. Brand lift studies are run for campaigns above a defined spend threshold.
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