I am not sure I can see a need for a store like this. Steam is already full of asset flips.
Pure asset flips, which in my eyes are if you purchase a template (or similar), don’t change a thing, slap a new logo on it and then release with claims of the game being developed by you, should not be encouraged at all. It’s just a lazy way to scam gamers, and it hurts the indie scene.
Games that use marketplace assets, modified or not, is not an asset flip. Instead of hiring someone to make custom assets, you buy them from the store. It doesn’t equal to laziness or a plan to do minimum effort for some sort of profit.
Of course it might look less unique, but it could still be a fantastic game. It might be counterproductive to label games as asset flips, just because they might contain unmodified assets.
Just my two cents 