I know nothing about this stuff, but it does seem to me that if you have no quality control over the stuff sold through your site, people may upload models that are extremely low-quality and hurt your reputation. I mean that people that have high-quality 3D files to upload will look at some of these low-quality models and simply assume that your site is not a profitable venture, and simply take their business elsewhere. Again, I have no clue what I'm talking about, but it does seem to me that this could end up being a very definite problem. Although, if you and Phil and maybe some other good modelers are providing the launch models, maybe this isn't really an issue. I would definitely be interested in selling something through a website like the one you describe (especially my textures, which have been well-received here), regardless. Since everyone seems to like the name "rendergods", perhaps you could simply expand the site you already have with an online store. Let me know if there is anything I can do to help (school permitting), although I do not know much about web development and maintenance. Best of luck to you and I hope this works out for you.