If your server becomes too quiet
How would you know? lol :P

If there's people that you would prefer never to see again
Have you played other MMOs? PSO is the best example, you would want to switch a character whatever and whenever you wish! ^^

If you'd like to move and play with a r/l buddy and not want to start over from scratch... There's plenty of reasons ^^
You are right that I do want my r/l friends to try ARR since most of them have never played XI or other MMO. I kinda worry if it has a timesink like XI and they would worry and don't want to waste their time since they have a life to do so.. xD

I wasted my $25 from Odin to Bahamut server.

A lot of people are content to start fresh by making a new character elsewhere, but when you have over 2 years of work packed onto one character, the cool 1.0 things like goobbue, swimsuits and the like, people are less inclined to give that up.

Don't forget what happen in XI when you only have one character and finish your own storylines just for once! What make it Final Fantasy!? o.o

You see... We are not going to play Tanaka's game anymore, we are now going to play Yoshi-P's (likely his personal idea) game. He decided to make us Legacy members with 40 character slots. If we are stuck with one character by slow leveling up and do something very little. Now you tell me what do we do with our 40 character slots? lol :3