I read your blog, I am not fully understanding. He sold you the site and the domain name. He pushes the name to an account he made for you. Which went through.
Later on, his site is not there anymore, and he's not responding after the transactions are done. You are saying that he planned it well in advance not to respond once everything is push and postive ratings feedback are left.
Could it be that he's done his part, once you receive the goods he should be able to be free of contacts or whatever? But you might be right that he could be trying to pull a fast one.
What evidence do you have to call that a scam really. Domain names push to you, site password and files to you, the goods according to what I read is delivered. Except for the hosting part.