The Founder’s Bias Trap
Picture this. You’ve just dropped £2,000 on LinkedIn ads and three enquiries land in your inbox. Do you chalk it up as a win or a waste? Most founders don’t know. That’s because we’re brilliant at convincing ourselves things are working. It’s called founder bias. We see what we want to see in the numbers. The odd enquiry feels like progress. Silence gets explained away as “wrong timing.” But here’s the thing. Your business doesn’t run on optimism. It runs on customers who buy, stay, and come back for more. If you aren’t measuring the right things, you’re building your business on sand.
The Funnel Nobody Talks About
We all draw funnels on whiteboards: Awareness → Consideration → Conversion. Looks great. But most founders forget the stage that really matters, retention. Keeping customers costs money too. Service, updates, engagement. Ignore it and your funnel leaks like a sieve.
And here’s where the 80/20 rule comes in. Roughly 20 percent of your effort will drive 80 percent of your results. The trick is figuring out which bit of the funnel delivers the most bang for your buck. For some businesses, the quickest win is converting warm leads into paying customers. For others, it’s holding onto existing customers a little longer. What rarely delivers, especially in the early days, is pouring money into awareness campaigns with no plan to capture and convert.
So be ruthless. If retention brings in the bulk of your revenue, put energy there. If conversion is your bottleneck, double down on that. Don’t spread yourself thin across every stage of the funnel, focus on the 20 percent that moves the needle.
Metrics That Tell the Truth (And Those That Don’t)
Customer Acquisition Cost (CAC): Don’t Trust the Headline
“We acquire customers for £30 each.” Sounds brilliant. But is that blended across all channels? Does it include the time you spent chasing them? For B2B founders, CAC includes coffee meetings, dinners, and weeks of follow-ups. For B2C, the platforms paint it prettier than it is. Always dig beneath the surface.
Lifetime Value (LTV): Stop Guessing
Investors love to ask about LTV. But unless you’ve got months of data, you’re guessing. You can make assumptions, sure, but keep updating them. Think of LTV as a moving number, not something fixed in stone.
Return on Ad Spend (ROAS): Your North Star
If one metric deserves your loyalty, it’s ROAS. Decide the ratio you need per channel and stick to it. Write your kill rules down before you start. For example, “if ROAS isn’t 5:1 within three months, we stop.” The trick is having the discipline to follow through when your heart wants to keep going.
Why Platforms Don’t Always Tell the Truth
Facebook, Google, LinkedIn, they’ll all show you conversions and tell you they’re doing great. But their glasses are rose-tinted. Their job is to make you believe. Your job is to measure reality. Even a simple spreadsheet will do. Track what really matters, not sign-ups, but who stays, who pays, and who gets value.
Short-Term Watch, Long-Term Learning
Numbers aren’t something you set and forget. Weekly checks keep you from nasty surprises. Monthly reviews give you space to test assumptions, compare channels, and spot patterns. One founder we worked with noticed their conversions always spiked on payday weekends. Without that, they would have misread the entire campaign. Measuring regularly isn’t busywork. It’s how you stop yourself from being blindsided.
B2B vs B2C: Different Games, Different Rules
In B2B, it’s not about clicks. It’s about conversations. The sales cycle is long and attribution is messy. That’s fine. Measure relationships, not impressions. In B2C, you need volume before you can trust the data. Don’t base decisions on 20 conversions. Wait for patterns. Be patient.
The Free Channel Founders Forget
Here’s something most founders overlook. Your best marketing channel might be the customers you already have. Referrals, recommendations, network effects. One founder doubled sign-ups simply by asking users to invite friends. It’s not glamorous, but it works. If you’re not using your customer base as a marketing channel, you’re leaving money on the table.
Making Decisions Without the Drama
Marketing decisions get messy when emotions take over. That’s why you set rules before you spend a penny. Pause if CAC goes above £50. Kill a channel if it doesn’t hit 5:1 ROAS. Write it down. Then stick to it. And don’t forget to leave a little room for experiments. Keep 10 percent of your budget aside for testing. If it works, brilliant. If it doesn’t, you’ve learned cheaply.
What Marketing Teaches Us About Fundraising
Funny thing is, the lessons here apply to raising investment too. Targeted beats scattergun. Consistency compounds. And your investor funnel deserves the same measurement as your customer funnel. Who’s in, who’s engaged, where are they dropping out? It’s not glamorous, but it works.
The Unsexy Truth About Success
Marketing success isn’t about viral moments or clever campaigns. It’s about measuring what matters and making steady improvements. Spreadsheets may not make you feel like a visionary, but they’ll keep you honest. Founders who measure ruthlessly give themselves a real edge. They don’t just survive. They build businesses that last.
Come and join the next Funding Mastermind to compare notes with other founders who are ditching vanity metrics and getting real about what works.
FAQs
How do I know if my marketing is working?
If it brings in customers who pay, stay, and generate value, it’s working. Anything else is window dressing.
What marketing metrics should startups track first?
CAC, LTV, and ROAS. They show you the cost to acquire, the value over time, and the return on spend.
How often should founders review marketing numbers?
Check weekly to catch red flags. Review monthly to update assumptions and make decisions.
Why do customer acquisition costs rise as I grow?
Because the early wins are easy. As you scale, you have to work harder and spend more to attract each customer.
What’s the cheapest way to grow marketing results?
Referrals and word of mouth. Your existing customers can often bring in the next ones — if you make it easy for them to share.
- Creating calm to bolster founder creativity: practical tools that work with Olivia Greenberg - February 9, 2026
- Ten Funding Lessons From Just Move In’s Tom Old: How Founders Can Build Momentum and Close Rounds - January 12, 2026
- The Reality Check Your Marketing Needs: Why Measuring Marketing Success Matters More Than You Think - September 30, 2025
