@jay: You can't sell a domain twice, you can't find domains on the thing for free and sell them. You actually can prove that you own a domain. The marketplace is for a lot of things, I just think selling DBs would create a lot of issues for people, I can sell you a broken DB with some issues you don't even know about till it's too late.

@happy: Of course, if you agree on that. But, lets say I "promise" you that the DB will be sold to you only, do you really trust someone to do so? I could sell it to someone else and you won't even know about it.