What you're actually paying for
Etsy runs your listings as paid ads on Google Shopping, Pinterest, Facebook, and Instagram at its own expense, then charges you only when a buyer clicks one of those ads and completes a purchase within a 30-day attribution window. You don't pay for impressions or clicks that don't convert — only attributed sales.
The attribution window is generous enough that it sometimes credits an ad for a sale a buyer was already going to make organically — that's the core objection sellers raise, and it's a legitimate one. There's no way to fully separate "this ad caused the sale" from "this buyer clicked an ad on the way to a purchase they'd already decided on."
When it's worth it
If your margin comfortably absorbs 12–15% — think 30%+ net margin categories like handmade jewelry, higher-ticket home décor, or commissioned work — Off-Site Ads is close to free incremental revenue: you only pay on sales that happened, at a rate most paid-acquisition channels would envy.
It's also close to break-even-or-better for sellers actively trying to grow beyond organic Etsy search reach, since running your own Google or Meta ads usually costs more per sale with far more setup effort.
When it isn't
On thin-margin or flat-fee-dominated categories — sub-$10 items where the $0.20 listing fee and processing flat fee already eat a large share of revenue — the extra 12–15% can turn a workable listing into a money-loser on every attributed order. This is exactly the shape of categories like stickers, digital downloads under $10, and greeting cards.
If you're under the $10k trailing-revenue threshold, this one is fully in your control: Shop Manager → Marketing → Off-Site Ads lets you opt out entirely, no downside beyond losing that specific traffic channel.