Lol basically sounds like every market currently on the deepweb (like hansa or alphabay). The idea is good, but to set up a fair and good community would be really hard. Even with escrow there is still a very high change of getting scammed. An idea like this will never work on the clearnet. Maybe with a lot of money and effort you can set it up on the deepweb, but then there will still be a huge gap between the people going from here to the actual site. Like people said earlier, great idea on paper but horrible in real life. Sorry for my englisch.
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You should probably do this on .onion and somehow market this in a way that will not grab feds attention. Having a public domain and promoting fraud is hard af to get away from. That's like trying to sell drugs on public domain.
Allectronics (01-19-2017)
You would probably need to facilitate both multi-sig and a proper decentralization for user security, which in themselves would take a considerable amount of effort to set up within a functional site. By that point you're probably operating an onion site, and have likely isolated a large portion of potential users. I suppose you could create a forum similar to this sub and then just keep as many aspects of it as possible hidden to people who don't need those exact services, but you're always gonna have risks when you have a moderation team handling funds.
too risky obviously ...
if someoane need a service he can make 2-3 search ///