Most 7-8 figure DTC brands think their biggest cash leak is marketing spend.
It's usually not.
It's the inventory that's already dying still receiving full ad spend while the clock runs out.
Here's what the pattern looks like
A variant has 18 days of sell-through left.
The reorder window already closed.
Meta is still optimizing toward it because the click data looks healthy.
Nobody connected the ad account to the actual stock position.
The campaign isn't failing. The inventory is.
And the spend keeps going out until someone pulls the weekly report and wonders why ROAS dropped.
By then it's already gone... the inventory, the spend, and the customer who landed on a sold-out page.
At a $5M brand running $50K/month in Meta spend, even 10-15% of budget hitting dying variants is $5,000-7,500 a month leaving with no possible return.
Not because the creative is wrong
Not because the targeting is off
Because nobody owns the daily alignment between what the ad platform is spending against and what the shelf can actually fulfill.
When did you last cross-reference your active campaigns against your current sell-through rates?
That number exists in your data right now. Most brands just aren't looking at both at the same time.