Follow demand, entry barriers and keywords down to unit economics: why should a new seller buying traffic stop? Estimates and unknowns are labeled in the full review.

One category holding two different businesses: 72.7% of it is manual brushes. Split out the powered half, price it at each tier the market supports, and the conclusion inverts — measured data only, no forecast models.

The third review, and the only one whose unit economics hold. But demand is down 40% year on year: a short-cycle opportunity, not a long position. All figures from live category data and identical 1688 listings.

The tool reported 168,228 searches against 139 listings. Put beside two near-synonyms, the figures differ by three orders of magnitude. And even taking the flattering reading, the price shelf cannot pay for ads: the allowed goods cost is negative.

110,052 units a month and 26,165 searches on the head term — price is not what closes it. The supply/demand index is 0.93, every comparable month of 2026 runs 3%–35% below 2025, and a two-round jury of 12 returned 0% purchase intent.