Don't use bittylicious becase they dont have any protection for the buyer the buyer could simply send the bank transfer and the seller can not complete the trade and never turn up again you just lost all your money.

Is it possible without getting the account banned etc? or blocked. I've created one via a VPN so I don't think a VPN is a problem....but to be logging in to it I would be using multiple VPN with different IP would this get the account banned?

Of course with Tor it's very well know which are tor nodes and the IP so would they get baneed/blocked for signing in?