Marketplaces tell you what they want if you look at what they return for the searches your product should win.
A storefront that returns zero results for every phrase your product describes is not a storefront. It is a page nobody can reach.
We measured five queries that a texture pack should win: texture, 3d, game assets, texture pack, pbr materials. Zero results for all five. The product appeared only when searching its own brand name, which is the one query a customer cannot type before knowing you exist.
That single measurement changed the channel plan more than any fee comparison. Traffic you have to bring yourself is a different business from traffic a marketplace hands you, and the fee difference only matters after the traffic exists.
The lesson generalises: before optimising the economics of a channel, check that the channel can deliver anything at all.