What Is Your Growth Really Costing You?

Growth is the goal for almost every business, and most owners know roughly what it's bringing in. Far fewer know what it's costing. That matters more than it seems, because revenue can grow every month while the business underneath it quietly gets weaker. It doesn't show up on a standard Profit & Loss report, at least not until it's expensive to fix, and it almost always starts the same way: the cost of winning each new customer climbs faster than anyone is watching.

Two different costs

Every sale carries two costs, and most owners only keep an eye on one. The first is the cost of serving the customer: the materials, labor, and time it takes to deliver what you sold. Revenue minus that is your margin, and most owners watch it closely.

The second is the cost of winning the customer in the first place. That includes advertising, commissions, your salesperson's salary and time, and the discounts you gave to close the deal. A quick note on wording, because it trips people up: accountants often use "cost of sales" to mean the first kind, the cost of delivering what you sold. This post is about the second kind, so I'll call it the cost to win a customer.

Most businesses never pull that second number out on its own. It sits inside a line on the books called something like "sales and marketing" or "advertising" and gets looked at as one total. The total isn't the useful part, though. The ratio is: how much did it take to win each new dollar of revenue, and is that getting better or worse? Here's a made-up example. If a thousand dollars in advertising brought in ten thousand dollars of new business last year, you spent a dime to win each dollar. If the same thousand brings in five thousand this year, it's twenty cents. The ad bill didn't change, winning business got twice as expensive, and nothing on a normal report would flag it.

Why nobody notices

Four things tend to hide the trend, and each one is small and easy to justify in the moment.

The first is averages. Most businesses get some customers cheaply, through referrals and word of mouth, and some through paid channels like ads or a salesperson. Here's another made-up example with round numbers. Last year, forty referral customers cost about $25 each to win and ten paid customers cost about $100 each, for an average of $40. This year the referrals hold steady, but paid customers now cost $150 each. That channel got 50% more expensive, yet the average only moved from $40 to $50. The cheap customers prop up the number you're looking at while the channel driving your growth gets steadily pricier.

The second is that rising spending looks like success. When marketing spending and revenue both go up, it feels like investing in growth, and nobody's first instinct is to check whether the ratio between them is slipping.

The third is discounts. Closing a deal at 15% off when the last one was 10%, or adding a free month to get a signature, is a real cost of winning that customer. It never shows up as an expense, though. It just looks like slightly less revenue per customer, which is easy to miss one deal at a time.

The fourth is sales pay. Good salespeople are in demand, and commission rates and guarantees tend to drift upward over time without anyone checking them against deal size or margin.

Any one of these on its own is manageable. The trouble starts when several stack up at once, quietly, for long enough.

How the spiral runs

It usually begins with a reasonable goal, like growing ten percent over last year. The easy customers are already yours, so hitting the goal takes more selling and more marketing than last time. The next customer costs more to win, because ads cost more to get noticed, a new salesperson takes months to pay off, and closing against the same competitors takes bigger discounts. So you spend more to keep growth looking the same, and that spending pushes costs up again the next period. Each trip around the loop runs at a slightly worse ratio.

It keeps going until margins get squeezed somewhere that can't last, or the cash runs out. Then the correction is sudden and painful: a channel gets cut overnight, people get let go, or prices get overhauled under pressure. The same adjustment, made two years earlier, would have been small. Nobody decides to enter the spiral. It happens while everyone is busy growing.

The warning signs

A few signs tend to show up early. It takes noticeably more spending to bring in the same amount of new business as it did a year ago. Deals close with bigger discounts or more extras than they used to. Sales take longer to close, while the share you win stays flat or drops.

The clearest test is a single question: what did it cost us, in total sales and marketing, to bring in each new dollar of revenue this quarter, and is that better or worse than last quarter? If the honest answer is "we'd have to dig for that," you have plenty of company. It also means the business could already be partway into the spiral without anyone having noticed.

What to start tracking

The number isn't hard to track once you decide to look at it. Track it as a ratio, total sales and marketing spending divided by the new revenue it produced, rather than as a raw expense. Track it by source instead of blended, so referrals, ads, and salespeople each have their own figure; the most expensive source is usually your early warning. Watch it over several quarters, since the direction tells you more than any single period. And compare it to your margin. A dollar that costs ninety cents to win and earns twenty cents is a very different business from one that costs ten cents, even though both show up as "a new customer."

All of this depends on your books keeping sales and marketing spending in their own categories rather than folded into one general expenses line. If yours don't, that's a good first conversation to have with whoever keeps your books, and they or your CPA can help you decide what a healthy number looks like for your business. It's also worth reviewing every quarter rather than once a year at tax time. By the time a rising cost to win customers shows up in an annual review, it has had four quarters to compound.

Growth feels like progress, and often it is. But a business can grow and get weaker at the same time, and the only way to tell which is happening is to know what your growth is really costing you.

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