I don't know if this is your plan, but that is something I always thought would be perfect for masternodes to run.  It would be a decentralized store.  Like ebay, you would rely on users to report illegal products (so masternode owners don't get into trouble).  Of course, that means there is some line that must be drawn.... not sure if that's what you're doing or want, but I still think it could be great to have.