Sounds like a lot of trouble to exploit XP gain. If people want to go to those lengths, more power to them.

It's as Yoshi-P said, the 50's have to give up time they could spend doing other things to benefit themselves in order to PL others.

As long as they aren't breaking any of the rules set in game, and they gain every bit of XP needed to go from 1 to 50, is it really a problem?