I'm not sure if it's still around now, but back in the early days of 1.0, you could "link" leves if multiple people had the same one.

I mentioned this in other threads, but seeing how I have all my classes/jobs to 50, I no longer have a use for exp. SE needs to implement some sort of system to where you can still earn exp past max level, but utilize it towards something else, similar to how there were merit points in FF11 or how you could use skill points in GW2 as currency. That, and/or award tomestones from certain leves, especially since we're supposed to be losing the weekly Mythology cap in 2.2.