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Last week a client sent me their best revenue month ever. Orders flooded in, the team scrambled to keep up, and two weeks later they checked the bank account and something felt off.

That’s what happens when you run a promotion without doing the math first.

I’m going to walk you through exactly what happens when you discount your product, why most founders are patting themselves on the back while bleeding profit, and how to structure promotions so you’re genuinely better off after than before.

Start with the math. Because the math is what almost no one does before they launch.

The Math Nobody Does Before They Discount

Say you have a $100 product with a 50% Contribution Margin (CM). That means after all your variable costs (COGS, fulfillment, shipping, returns, payment processing, all of it) you keep $50 per unit sold.

Now you run a 30% off promotion. Price drops to $70.

Here’s the part people miss: your variable costs don’t drop. You still need that $50 to fulfill the order. So now your CM per unit is $20, not $50.

You dropped your price 30% and your profit per unit dropped 60%.

If you were selling 100 units a month at $50 CM each, that’s $5,000 in contribution dollars.

At $20 CM per unit, you need to sell 250 units to make the same $5,000. Two and a half times the volume, just to break even on contribution margin.

And that’s before you factor in something most people miss entirely: a percentage of the buyers during your promotion would have bought anyway at full price. So you’re handing a discount to people who were already going to give you the full $50. That’s pure margin walking out the door.

The Hidden Cost That Makes It Worse

There’s another problem with running heavy discounts regularly: you train your customers to wait for them.

Once buyers figure out you run a 30% off sale every six weeks, they stop buying at full price. They wait. Your full-price sales slow down. Revenue flattens between promotions. And then the only way to spike it again is another promotion.

I’ve seen this play out enough times that I can almost predict when a founder is in that cycle from looking at their revenue curve.

Big spikes, flat valleys, repeat. The spikes feel good. The valleys create anxiety. And every cycle chips away at margin a little more.

How to Do Promotions the Right Way

None of this means you should never run promotions. I love promotions. When you build them correctly, they’re one of the most powerful things you can do for your business.

Here’s how to do them right.

Step one: Establish a contribution margin floor.

Before you run anything, know the lowest CM percentage you can accept on any given product and still have the business make sense. That floor is non-negotiable. If a promotion would push you below it, the promotion doesn’t launch in that form. Period.

This gives you a decision filter you can use in about 30 seconds. Run the math on the discounted price, check it against your floor, and you know immediately whether the promotion is viable.

Step two: Model the numbers before you launch.

This sounds obvious. Almost nobody does it.

Take your actual contribution margin, apply the discount you’re considering, and calculate how much volume you’d need to hit your CM dollar target.

Then ask yourself honestly: is that volume realistic? Do I have the email list and the audience to pull it off?

If the answer is no, the promotion either needs a smaller discount or a different structure.

Step three: Add value instead of cutting price.

This is the one that changes everything.

Think about what you’re giving up when you drop $30 off a $100 product. You’re giving up $30 in CM per unit. That’s what you need to protect.

So what if you added something that costs you $15 but feels like $100 in value to the customer? Maybe it’s a complementary product, maybe it’s a bonus they actually want.

Now your CM drops from $50 to $35 instead of from $50 to $20. You need to sell roughly 43% more units to match your baseline, not 150% more. That’s a completely different math problem, and a much more solvable one.

The key insight: customers aren’t buying price. They’re buying perceived value versus perceived risk. Drop the price and you reduce their perceived risk. Add something valuable and you raise their perceived value. Both moves make the offer more attractive — the difference is which one destroys your margin and which one protects it.

The Move That Unlocks Everything

Here’s the thing about promotions that almost no one does: the smartest promotions are built to acquire customers with a known, high long-tail value. Day 1 contribution margin is secondary.

If you know that customers who buy Product A have a 60% reorder rate within 30 days, or that they ascend to a higher-ticket offer at a predictable clip, or that they go on subscription and stick for 12+ months — that changes the math entirely.

You can afford to run a tighter promotion on that product because you know what comes after. You’re looking at $20 in CM from the sale, plus whatever that customer generates over the next 12 months.

When you factor in that downstream value, a promotion that looked like a bad deal on Day 1 can look like a very good deal overall.

I have clients who’ve built this into their entire promotional strategy. They know which products lead to which outcomes. They know their ascension paths, their reorder rates, their subscription stick rates. Because they know that data, they can make deliberate decisions about when a loss leader makes sense and when it doesn’t.

That’s what separates a promotion that builds the business from one that spikes revenue for a week and disappears.

Before the Next Promotion

Run the damn math first.

Before the next promotion goes out, calculate your CM at the discounted price. Figure out how much volume you’d need to justify it.

Check whether a value-add approach protects your margin better than a straight discount. And if you have data on customer lifetime value by product, use it to decide whether this is a profitable acquisition play or just a discount with a nice graphic.

Promotions work. I’ve built automated promotional campaigns for clients that generated 5x to 6x ROAS every time they ran, on autopilot, for years. But the ones that work are built on math, not excitement.

Know your floor. Model your volume. Add value where you can. And if you know your LTV data, let that be the lens through which you make the final call.

Do all of that, and promotions become a reliable profit lever instead of a gamble you run when revenue feels soft.

If you want to go deeper on contribution margin, promotion math, and the full five-lever system behind it, the framework is in my book, The Scalable Profit Model. Grab a copy at scaleadvisors.com/book.

And if you’d rather work through it with me directly, reach out at scaleadvisors.com. If it’s not the right fit, no worries.

I appreciate you,

Jeremy Reeves, Founder & CEO, Scale Advisors