To put one issue to rest, this isn't going to be a free-to-do-whatever market, in the sense that anybody from anywhere can put something up for sale at any price.
Instead, we're going to focus on cultivating very high quality content to put up. Mostly art, sounds, music and pro-grade kits. I think that focusing on a less is more approach is the right way to go, rather than a free for all, which would be a logistical nightmare for us to handle. This does mean an approval process, but the result will be a guarantee that there isn't crap lying around. It's a win for our users, for us, and for the authors.