Like I said, EXP levels in beta right now are not how they will be in the release. This has been said by blues, it's confirmed, the only reason they have it where you can level pretty quickly right now is because otherwise the higher level issues wouldn't arise in beta for weeks and it would take a lot longer of a beta.

A blue said almost exactly that "Leveling from 60-70 will take around the same time as level from 1-60." I'd find the exact post but I'm too lazy.