Selfish maybe a strong depending on how people look at it. You are asking for a free transfer off a full server. For who? For you? Or for other people? If you are asking for others to leave so you and your guilds can a better experience, then that is a selfish attitude.
Blizzard has offered free transfer off over populated servers before, I played on one, and the free transfer is only to pre-designated low population servers. You can only choose from a selected list. Sometimes it works out for some people, sometimes it does not and then people wants another transfer to a more populated server due to low populations.
I have seen this happen before on a server I played on, Warsong.