Aha! I think that I came across my answer - reactioncommerce/reaction#357 It's going to be the former -- If I read that correctly, users will be able to upload products to their own part of the reaction commerce site, right? If so, I CAN'T WAIT!!! :D I think that the "marketplace" idea is what I was trying to describe above. I'm happy to help test and work on a dev package if there is one at this point.