I can understand your point of view. However..
IF solo'ers got a lot more xp as you suggest noone would group.
Mages... what about mages? They probably cant solo higher leveled mobs.
SOE has to try to balance the experience and they may not always succeed from our point of view, but I'm sure they will listen and react if there is a REAL balancing problem.
What you are talking about isnt a balancing problem. What you are talking about is, that you want to level just as fast in a few hours as one that is dedicated and plays a LOT more than you. Sorry to say so, but THAT wouldn't be fair.