We are able to sell names in Diablo 2 and EVE

WoW Names are unique as well

Same potential problems as with selling names on D2 and Eve which is could potentially be botted, but i believe there is less chance for names being botted on wow since it is server dependant

As far as I understand, you can pay $ to change your name on WoW so I don't think this will ever happen. Sorry.

Name changes on WoW cost money, Due to this it will not be allowed.