An idea in progress

Lvl class and funding as in range would allow you to calculate the average amounts of hits needed to kill the mob. Divide by exp (or the other way around for exp/hit) and you have a good means of telling of how good the monster is to train on. Maybe tweak abit for "mobbyness" giving maps with large spawn a better score and that'll be all you need.

I think this would be a very good idea for a well balanced game. Unfortunately, for maple, the same mobs are going to come out everytime: Like jesters and that other lvl 50 mob in the haunted house, and LHC crockies for 110+ :^/