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What sells the most isn't what clears the most

By the end, you'll know, for the first time, how much came in this month from each service you offer, not just how many times it sold.

By Yodai · Published on September 6, 2026 · Updated on October 12, 2026

You look at the month's schedule and see that one service shows up forty or fifty times. Everything else appears just a handful of times, scattered here and there. The natural read is that this is your star service, the one holding up the business. That might not be true.

Selling a lot and actually making money from what you sell are two different things, and it's easy to mix them up. A Cornell University hospitality journal article on spa management points this out for that industry: many businesses judge how they're doing by sales volume, which is like a hotel measuring only occupancy without looking at the average price per room. You notice the "times sold" number because it jumps out at you: a full calendar, a waitlist of customers, word of mouth around the neighborhood. The number that actually matters, how much money comes in per service, isn't obvious at a glance: you have to calculate it.

That's what this lesson is for. So you stop counting visits and start adding up dollars, service by service. By the end, you'll have the real revenue for each service you offer, not just how many times it sold this month.

Count what comes in, not how many times someone walks in

Imagine a hair salon with four standard services: a haircut for $15, color for $60, a manicure for $18, and a keratin treatment for $130. In a normal month, the haircut sells sixty times, the manicure thirty-five, the color eighteen, and the keratin treatment five.

It makes sense. A haircut doesn't need extra buffer time on the calendar. A manicure gets added without a second thought once the client is already in the chair. Color requires picking a shade and fitting a long appointment into just the right slot. A keratin treatment, frankly, scares people off with the price.

If you ask the owner what her main service is, she'll say haircuts without a second's hesitation. It's the one filling the schedule, the one she sees coming and going all day, the one she associates with "business is good today." But a full schedule and a full cash register aren't the same thing, and the difference shows up the moment you run the numbers.

This holds true whether you offer four services or fourteen. And the more you offer, the harder it is to keep your whole calendar straight in your head.

The service that "sells the most" is actually second on the list of what brings in the most money. If you only looked at the calendar, you'd never have noticed. The keratin treatment, which gets booked barely five times a month, brings in even more than the manicure, which sells seven times as often.

Now picture a personal trainer. Their eighty group classes a month, at $8 each, add up to $640. Their twenty one-on-one sessions, at $45, add up to $900. They sell four times as many group classes, and the one-on-one sessions still bring in more money.

And if you sell products instead of appointments, the math is identical. A candle shop might sell a hundred units of the small size at $6 and twenty of the large size at $38. The small size wins on units, the large one can win on revenue. It doesn't matter whether the number comes from the Bookings screen or the Orders screen in your dashboard: the calculation is always units sold times price.

What if the cheap one is what brings in customers for the expensive one?

That's a fair objection, and sometimes it's true: a cheap haircut can be the way someone discovers your salon, and months later, they work up to getting color done. One service can support another without being the top earner on its own.

But that doesn't change what you need to do this week. First you need the number for each service, plain and simple, without mixing it in with the story you tell yourself about what each one is for. If you mix the numbers with the theory of "this one brings me customers for the other one" before you have the actual figures in front of you, the excuse will always favor the service you already sell the most, because it's the one you know best.

Write down the number first. If one service really does support another, you'll see it more clearly in a couple of lessons, when you compare not just what each one earns but what it leaves you after costs.

Why a full schedule is fooling you

A full calendar feels like a healthy business. Every booked slot feels like a small win. But when you count appointments, a $15 one and a $60 one add up to the same thing: one more appointment. In your bank account, they're not worth the same.

In the salon from the example, the cheap service is also the easiest to sell: it costs less, it's a quick decision, it gets booked almost on impulse. That makes it the most visible, not the most profitable.

The pricier service usually sells less often because it takes more thought to commit to it. And precisely because of that, it gets less attention: it's promoted less, offered less, and given less room in the week's calendar.

Every service takes up a calendar slot, and your calendar has a limit on hours, not on money. If you fill those hours with the cheap stuff because that's what people ask for most, you end up at the end of the month feeling like you worked nonstop with a cash register that's short. That's why, in that article, Sheryl Kimes and Sonee Singh suggest spas stop looking only at appointments and instead measure revenue per available treatment hour, a figure that combines the price and the length of each treatment.

Write it down this week, don't just estimate from memory

You don't need any special software or a complicated spreadsheet. A simple four-column list will do: the service, how many times it sold this month, the price, and the total from multiplying those two numbers.

Do this with the numbers from the month that just closed, not a guess off the top of your head. From memory, the mind takes shortcuts. Psychologists Amos Tversky and Daniel Kahneman described one: to estimate how often something happens, we tend to go by how easily we can recall it, and frequent things get remembered better and faster. That's why the service you see most often is the first one that comes to mind, whatever it actually earns.

If your appointments or orders come in through your Yodai website, the Analytics screen helps you check this: with the 30-day period selected, it shows the five services or products requested most and how many times each one was ordered. Multiply each number by its price. Keep in mind this covers the last 30 days, not the closed month, and anything that doesn't make that top five is still in your Bookings or Orders list.

If you don't keep any record of sales by service, this is the reason to start today. Without that data, you can't run these numbers, and everything in the upcoming lessons depends on getting this part right.

The salon table from earlier is exactly the format you need to fill in with your own services and your own numbers. Four columns, one closed month, nothing more.

Now you know how much comes in from each service. But that number isn't yours yet: you have to subtract what it costs you to deliver it. That's next: breaking down the price of each service to see what you actually have left, free and clear.