Yes, Poser and Daz Studio . Most of the graphics I use in my 2D games are rendered in Poser software. That gives them a 3D look, while being 2D.
Those of us who are vendors at these stores, must model the 3D objects for resale by hand. Here polycount is less important because people are rendering the 3D objects, or making animation videos, rather than using the 3D in a real-time environment like games. If I had software that could let me make unique products, like making it off a 2D image I could draw, then it would really speed up my production time.
Vendors making content to sell at places like the Unity Asset Store, and Itch.io, may also be more willing to pay for this type of software, because they could also speed up their production times.