I like this idea and was thinking about this before seeing this thread. Some of the exploits named here that come with the ability of having an additional character could be prevented by possibly making it so that you cannot log out of one character and then log back into the same server with a different character. You would be forced to join a different server. This way people will not be able to scout around with a new character for the geared one to come in and clean house. Or the reverse; clear an area with the good character in order to gear a second.