Believe it or not not everyone is going around getting PL'd from 1-50 in a single day. I've been in several xp parties over the past month none of which had a PL or even mentioned getting a PL. Furthermore you should really not be bothered by other people getting to cap so fast. The only thing that should possibly bother you is that perhaps players will leave if they have no classes to level however if the main thing keeping players in this game is leveling a class from 1-50 that makes for a pretty poor game and I think a lot of players would leave for that reason alone (as they already have).