Well, if you were forced to deposit 50 bitcoins (or whatever number) into a buyers account and there was no way to transfer that money to another account. It would have to be used for purchases. So, yes, a scammer could make a lot of accounts, but its going to cost him a lot to do so.... Or heck make it 20 bitcoins. Thats only a couple hundred bucks. Then after they have spent that money that can then do peer to peer transfers, etc. It wont stop people from opening up new accounts, but it will slow down the scammers, thats for sure.. That way vendors could say, if you have less than 10 successful transactions, your items are limited to 1 pill. 20 transactions up to 10, 30 or more unlimited. Im just spitballing, but that way, it doesn't cost the buyer a penny to join yet he needs bitcoins to purchase. If I were a new buyer, I wouldn't mind if I had to deposit 200 bucks, hell, you need that much to make just a couple of transactions, some not even one...