In my opinion, it is good as it is.
There are already many so called "mentors" that just take disciples for the gifts and never care for them nor give them any help.That's just plain selfish, and raising the drop rate of the uber weapons would only increase the number of such mentors.This could also result in more beggers in the major tp's that dont know a thing about
EU 'cause they never learned anything from their mentors.