I'm not sure a potion would be the best idea. As someone who has been playing for twenty days without even STARTING on the class I really want to play (AST), I agree that new players who join late have a tough time. But this potion wouldn't skip anything but the grinding, right? MSQ would still be mandatory, class quests would as well, so--the jump potion wouldn't do anything that an xp gain re-balance wouldn't? I'd rather they just upped the MSQ xp so leveling could be done on that and class quests alone.