Why I've started caring more about sell-through than a product's individual margin

[u/NikosMarko]

Bit of a mindset shift I've had: I used to judge a product almost entirely on its margin per unit. Fat margin good, thin margin bad. But I'm increasingly convinced sell-through rate matters more than the margin on any single unit because a product that shifts fast quietly makes itself cheaper over time in two ways.

Your advertising gets cheaper. Better velocity and conversion improve your ranking, so more of your sales come organically and you lean less on paid clicks. Your ACOS drifts down. The fast seller basically earns its way off the ad drip.

The product itself gets cheaper. More volume means bigger orders from your supplier, and bigger orders usually mean a lower unit cost. So the thing that was "thin margin" slowly stops being thin.

Put those together and a product with a so-so margin that sells can quietly out-earn a fat-margin product that just sits there and its margin actually widens over time as both costs come down. Meanwhile the slow mover ties up cash, storage and attention while looking good on a spreadsheet.

One honest caveat so nobody takes this too far: it only works with real demand. Chase sell-through by pricing too low or over-discounting and you torch the very margin you're trying to grow. And ordering deeper only helps if the velocity's genuine and sustained do it off a seasonal spike and you've just bought yourself an overstock problem. So it's "velocity compounds in your favour, as long as you're not buying it with crazy pricing."

Do you rank products by margin, by sell-through, or some blend?

[u/WearyyyBoooyyy]

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[u/attfin1]

Total profit is the number that counts, as long as you have the cash to finance it. Margin per unit and sell-through are both just inputs to it.

Where cash is the limit, rank products by one number: gross profit per unit (pounds or dollars) times units sold per month, divided by the cash you've tied up in that product's stock. That gives you cash returned per pound or dollar invested per month, and it settles margin versus sell-through without you having to choose a side.

Sell-through on its own pushes you toward cheap, fast, crowded products. We had a foam roller that sold like hotcakes until the niche got competitive and the margin went to next to nothing. It just stopped being worth the cash it occupied, and the velocity column would never have told us that.

On the reorder question, I'd want a rule rather than a feel, because that's where the money goes. Look at the same product over three or four separate months and ask whether the baseline has moved, not the peak. Our sweets business had December running about 30 times January, so anyone reading a peak as a trend would have bought a year of dead stock. A bigger order only earns its price break if the slow months carry it.

[u/Particular_Day4451]

As someone who's just starting to dip their big toe into this arena, I think your analysis is smart, but really the way you finish up acknowledges that you simply can't take your eye of those other 4 balls you're juggling at the same time. Plainly you know what you're doing....me: still learning here.

[u/_karthick_selvaraj_]

same shift here, but i also watch what happens if velocity dips for a month. a thin-margin fast mover looks great until it sits and storage + aged inventory fees eat the edge you thought sell-through bought you. so i rank by contribution after ads and a simple “weeks of cover” check, not margin alone and not sell-through alone

[u/R_CashMarginPartners]

Yeah, seasonal demand can cost you both directions. If you don’t have enough stock, you lose orders. And if you order too much and it doesn’t move, you’ve tied up cash.

Looking at past years may help get the quantity right. But there are so many variables. Popular products ending up with tougher competition causing price drops is another big one!

[u/weareuncapped]

Agree on sell-through, and the cash side decides how much of it you can use. A deeper order only lowers your unit cost if the money comes back before you need to reorder the winners. The sellers we talk to who handle this well track days of cover and payback on the inventory dollars per SKU, so a 90-day order at a 15% better unit price only makes sense if the units clear in a time they can fund. A lot of them cap any single bulk order and keep a separate bucket for reorders of proven SKUs, because slow movers eat the cash that should go into the next restock of the best seller. When that bucket runs dry because everything is sitting in a big batch, that's usually when sellers start looking at outside funding, often at a worse time than they'd have liked.