You raise a very good point, the 10 dollar fee per asset will in return help us honest sellers to make more sales, as it will prevent (as you said) our assets being drowned in a flood of AI-gen or stolen assets.
Making the 10 dollar back is usually just one sale, as most assets are priced higher than ten. If you make a good quality asset and you also do good documentation and presentation on the store page, it won’t take long to get at least more than one sale.
It’s either a flat fee per published asset, or Epic forbids the upload of AI generated assets (or “hides” them in a seperate category / page).
Since Epic doesn’t seem interested in the latter, a flat fee is the only thing that can save FAB, before it implodes under the flood of cheap AI / stolen assets.