Perhaps a potential revenue stream to create a “publish” feature for models where users could publish models to a store and make a profit but also the developer could get a percentage of all sales. Although for some reason I feel this may violate Apple’s terms?
To at least have a repository to upload and download (and perhaps preview in 3d before downloading models) would be great. 123d Sculpt had something like this. Perhaps you could add “like” and “downloads” stats for models