Transferring servers is WOW TBC Gold never straightforward. It is impossible to know the quality of your new server more or less than yours. I've seen it first hand in Vanilla, where our guild moved to a different server. Within a few months, our population had dwindled to a few hundred at the peak times.
While it's true that people have never been able to swap characters with their characters however, they could have in the event that cheap Burning Crusade Classic Gold they thought the lines were getting too long.