Google Ads
Sometimes. But "no sales" is not enough information to decide.
A product that received 30 impressions and no clicks has barely been tested. A product that spent $800 with 400 clicks and zero purchases has much stronger evidence against it.
Check: product title and feed relevance; price; shipping; product-page conversion; stock; query intent; margin; tracking. The campaign may be exposing a merchandising problem rather than an advertising problem.
A low-selling product may have high margin, strong repeat purchase or an important role in introducing customers to the brand. Conversely, a high-revenue product with terrible margin may deserve less budget than the ROAS suggests.
Removing weak products can concentrate spend on proven opportunities, but excessive pruning can make the campaign dependent on a tiny catalogue and prevent discovery. Use enough data, understand the economics and keep room for controlled testing.
If you are unsure which PMax products are wasting spend and which simply need a better feed or landing page, contact us.