Affiliate Marketing: What It Is and How It Works
What affiliate marketing is, how it works, commission models (CPA, CPS, CPL), top platforms, pros, cons and how to measure conversion.

79% of marketing leads never convert into a sale (MarketingSherpa, 2025). The problem isn't lead generation — it's what happens, or doesn't happen, in the mid funnel.
Most marketing teams focus their efforts on two extremes: generating awareness (top funnel) and closing sales (bottom funnel). What's left in between — the mid funnel — is where the most valuable opportunities are lost. This article explains how to work this stage strategically.
The mid funnel, also known as MOFU (Middle of Funnel), is the consideration stage of the conversion funnel. The user already knows your brand or your solution, but hasn't decided to buy yet. They're evaluating options, comparing alternatives and looking for reasons to trust you.
| Stage | Name | User state | Goal |
|---|---|---|---|
| Top funnel (TOFU) | Awareness | Doesn't know your brand or doesn't know they have a problem | Capture attention, educate |
| Mid funnel (MOFU) | Consideration | Knows they have a problem and is evaluating solutions | Nurture, build trust, differentiate |
| Bottom funnel (BOFU) | Decision | Ready to buy, comparing final options | Convince, close the sale |
The most common mistake is treating the funnel as if it only has two states: "doesn't know me" and "wants to buy." The reality is that most users spend considerable time in the mid funnel before making a decision. Ignoring this stage is like inviting someone to dinner and forgetting to prepare the food.
A lead who downloads an ebook isn't a customer. They're someone who has shown surface-level interest. Without a nurturing process that guides them from that initial interest to a purchase decision, most of those leads go cold and disappear.
These numbers tell a clear story: the difference between a pipeline that converts and one that doesn't lies in how you work the mid funnel.
Mid funnel content has a specific goal: help the user evaluate your solution as the best option. It's not awareness content (generic, educational, no mention of your product). Nor is it direct sales content (pricing, features, buy CTA).
1. Case studies Nothing builds more trust than demonstrating real results with clients similar to the prospect. A good case study includes: client context, identified problem, solution applied, measurable results and timeline.
2. Honest comparisons The user is going to compare anyway. If you provide the comparison, you control the frame of reference. Include your solution alongside real alternatives, with pros and cons of each. Honesty builds more trust than marketing.
3. Webinars and demos They allow the user to see your product or service in action without the commitment of a sales meeting. Webinars with live Q&A are especially effective because they address objections in real time.
4. Implementation guides Content that shows what it would be like to work with you or use your product. It reduces uncertainty and makes tangible what was previously abstract.
5. Calculators and interactive tools ROI calculators, product configurators or assessment tools that help the user quantify the value of your solution for their specific case.
6. Sequenced email nurturing Email sequences that progressively deepen: from educational content to social proof, from social proof to differentiated value proposition, from value proposition to conversion CTA.
The backbone of mid funnel for most companies. A well-designed nurturing sequence accompanies the lead over weeks or months, providing value in every interaction.
Recommended structure:
| Week | Content | Goal |
|---|---|---|
| 1 | Educational resource related to the lead's problem | Reinforce that you understand their problem |
| 2 | Case study from a similar client | Build trust with social proof |
| 3 | Comparison or evaluation guide | Help with option evaluation |
| 4 | Webinar or recorded demo | Make the solution tangible |
| 5 | Differentiation content (why you vs. others) | Position your solution as the best |
| 6 | Offer or conversion CTA | Trigger the decision |
Mid funnel retargeting targets users who have interacted with your TOFU content but haven't converted. Retargeting campaigns with MOFU content (case studies, testimonials, demos) have 10x higher CTR than standard display.
MOFU retargeting segments:
Assigning a score to each lead based on their behavior helps identify when a MOFU lead is ready to move to BOFU. Actions that add points:
When the lead reaches a defined threshold (e.g., 80 points), the handoff to sales or direct conversion CTA is triggered.
In the mid funnel, social proof isn't a generic logo on your homepage. It's relevant and specific social proof for the lead's segment:
Measuring the mid funnel isn't as intuitive as measuring awareness (impressions) or conversion (sales). But without metrics, you're flying blind.
| Metric | What it measures | Indicative benchmark |
|---|---|---|
| Email open rate (nurturing) | Interest in your content | 25-40% |
| Email CTR (nurturing) | Depth of interest | 3-8% |
| Time on page (MOFU content) | Quality of attention | >3 minutes |
| MOFU content downloads | Evaluation intent | Depends on volume |
| Webinar attendance | Active commitment | 30-50% of registrants |
| Metric | What it measures | Why it matters |
|---|---|---|
| MQL to SQL conversion rate | % of marketing leads that pass to sales | Quality of nurturing |
| Pipeline velocity | Average time from MOFU to BOFU | Mid funnel efficiency |
| Lead scoring velocity | Speed at which leads accumulate points | Signal of growing intent |
| Content influence | MOFU content that appears in conversion journeys | Identifies what content works |
MQL to SQL conversion rate (Marketing Qualified Lead to Sales Qualified Lead). If you're generating lots of MQLs but few pass to SQL, your mid funnel isn't nurturing properly. The benchmark varies by industry, but a healthy range is between 15% and 30%.
Not all leads are equal. A lead who arrived searching "what is CRO" needs different content than one who arrived searching "best CRO agency Barcelona." Segment your nurturing sequences by intent, acquisition source and behavior.
Use the data you have about the lead (industry, company size, website behavior) to personalize MOFU content. A case study from their industry is 3x more effective than a generic one.
Every mid funnel interaction should be easy and low-commitment. Don't ask for a sales meeting when the lead just wants to see a case study. Gradually escalate the level of commitment.
The marketing-to-sales handoff is the most critical point. Clearly define when a lead is ready for sales (lead scoring), what information the sales team receives and how the transition is made.
A/B testing in nurturing emails, MOFU landing page optimization, experimentation with content formats. The mid funnel is an iterative process, not a static setup.
The mid funnel is where conversions are won or lost. It's not enough to generate leads and hope they buy on their own. You need a deliberate nurturing strategy, relevant content and metrics that allow you to optimize continuously.
If you want to optimize conversion at any point in the funnel, at Boost that's exactly our job. And if you prefer to start with a quick diagnostic of your website, try Scan&Boost.
— Adrià Vidal
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