Originally published on Forbes

A few years ago, I was sitting in a planning meeting with a CEO and leadership team. We were looking at next year's revenue target and asking the same question almost every growing company asks.​

"How many more leads do we need?"​

The conversation quickly turned into larger advertising budgets, more campaigns, more content, more events and additional sales development capacity. Hitting the number was going to require a meaningful increase in marketing spend.​

Then someone asked a question other than how to generate more leads: Why weren't existing opportunities becoming customers?

If we could improve lead-to-customer conversion by just a few percentage points, we could reach nearly the same revenue target without dramatically increasing acquisition costs. That conversation fundamentally changed how I think about growth.​

After more than 15 years leading product marketing and growth across business-to-business (B2B) SaaS companies, I've found that most organizations underestimate how much revenue is already sitting inside their existing pipeline. The instinct is to buy more opportunities, but the bigger opportunity is often converting more of the ones you already have.

The most expensive way to grow

​Lead generation naturally gets most of the attention because it's easy to measure, easy to budget for and easy to celebrate. On the other hand, improving conversion feels more complex. It usually requires marketing, product, sales, customer success and leadership to work together. ​

No single team owns the entire buying journey, so conversion often becomes everyone's responsibility and nobody's priority. Ways to improve conversion can be spread across onboarding, messaging, product experience, pricing, customer proof and sales conversations. Yet improving conversion can produce the same revenue outcome as generating significantly more pipeline, but at a lower cost. ​

Acquiring more leads usually requires ongoing investment. Improving conversion often creates lasting gains that compound over time.

The growth opportunity hiding in lost deals​

One of the first things I do when joining a company or starting a major growth initiative is interview people who almost became customers but didn't.​

That includes failed product trials, opportunities lost to competitors, prospects that disappeared during evaluation and even customers who eventually churned. The goal is to understand what happened from the buyer's perspective.​

After enough interviews, patterns begin to emerge. Buyers explain that onboarding felt overwhelming. They couldn't picture how the product would fit into their business. They struggled to convince internal stakeholders. They needed an integration that wasn't available. They couldn't find enough proof that companies like theirs had succeeded.​

These stories usually surface the same handful of problems appearing over and over again, and those patterns become a roadmap for improving conversion.

How to measure the opportunity

Customer interviews don't just tell you why you're losing deals. They also help you estimate how much revenue those improvements could unlock.

Imagine your company generates 1,000 qualified leads or free trials each month and converts 25% of them into customers. That means you win 250 customers and lose the other 750.

Defining your options

Now imagine your goal is to grow revenue by 10% without changing your pricing. You have two options. You can generate 10% more qualified leads, or you can improve your conversion rate. The real question is which approach is easier and more cost-effective.

Option 1: Buying more leads

Let's start with lead generation. If your cost to acquire a qualified lead or free trial is $250—which is relatively low based on my experience—you'd need to spend an additional $25,000 every month to generate another 100 qualified opportunities. That's also assuming your cost per trial doesn’t increase with higher levels of paid acquisition.

Option 2: Converting more leads

The second option is to improve conversion. In this example, you'd only need to increase your conversion rate from 25% to 27.5%. In other words, you only need to recover 2.5% of the opportunities you're currently losing.

This is where customer interviews become so valuable.

Suppose you interview 20 of the 750 prospects who didn't buy. You only need to uncover one customer with an addressable reason for losing the deal. It might be confusing onboarding, weak messaging, missing customer proof, pricing concerns, poor follow-up or a product gap.

Quantifying the revenue potential

In my experience, you'll usually find much more than just one customer with an addressable loss reason. It's common for four to six out of those 20 interviews to reveal loss reasons your company can realistically address. If that pattern holds across your customer base, it suggests that approximately 20% to 30% of your lost opportunities could be recoverable over time.

In this example, that's the equivalent of roughly 150 to 225 additional customers each month without generating a single new lead (i.e., 20% to 30% of 750 lost opportunities).

Of course, you shouldn't expect those results overnight. Some improvements take months to design, build, test and roll out. But the interviews give you something just as valuable: They show you how much revenue could be unlocked if you solve the right problems.

Before you buy more leads​

This approach works equally well for product-led and sales-led businesses. In product-led companies, you're learning why qualified free-trialers didn’t continue the self-initiated buy process. In sales-led organizations, you're learning why qualified buyers ultimately abandon the sales-assisted buying process.​

Either way, the objective is the same: remove unnecessary friction from the buying experience. Not every lost deal can or should be recovered. Budgets disappear. Priorities change. Some companies simply aren't a good fit.​

The opportunity lies with buyers who genuinely wanted to solve the problem but encountered friction your company can remove. ​

Lead generation will always matter. Every growing company eventually needs more people entering the funnel. But before increasing your marketing budget, ask a different question. How many future customers are already telling you exactly why they didn't buy?

The answer may reveal that your next stage of growth isn't sitting at the top of your funnel. It's already somewhere inside it.​​