Seth's hard-to-interpret post (was it a suggestion?) makes me think of the idea, obviously borrowed from a number of games, of an experience bank. Once a character hits max level they could be allowed to "bank" some small % of experience gained (similar but separate from guild tax) possibly using an @command to store it for the account. Later a related @command could be used to withdraw experience on another character. You could make it immensely small, say, 1% or so? Maybe a bit higher, but that's debatable. It would be enough to make early levels go fast but not enough that it's really worth trying to use this method to totally bypass leveling unless it's a class you hate.
It's actually a pretty great way to motivate players to party with established characters because it will still be helping them level less "desirable" party characters if they choose to bank experience while they do it. It gives 99/70 characters a reason (beyond helping friends/guildies/random people) to continue to do parties that are focused on leveling.
It also makes leveling characters that don't get parties often a little more bearable.
