Buying character slots?

[Niwashi]

Character information is still stored server wise, and seeming you're talking about more alts specifically on Balmung, do you realize the information bloat that would happen on the RP server if that were possible? Remember, they back up their entire database at an incredible rate, so storage isn't the only issue, it's backup.

Well, if this is really getting in the way, they need to fix their backup process. Of course, they need to have backups of everything, but only the characters who are actually logged in are changing and need to be re-backed up frequently. As already pointed out, no matter how many characters you have, only one can be logged in at a time, so only one should need it's back-up copy to keep being constantly refreshed like that.

Also, being able to roll on other servers gives you a chance to meet new people, so why not take the opportunity to branch out some?

This part I agree with, though. If you're going to have that many characters, it doesn't hurt to branch out a bit. Meeting more people along the way can be a good thing.