exploit or not, the trouble is more about the reaction of the other. let's say you play dragoon, you can't get this exp the other get, mostly because dragoon in AoE is not...well you get the point.
what is your solution? wait the other have gather all this exp? or try to get your medal by doing the fate?
if you choice the second solution you will be insulted believe me, did happend to me.

@silverharp: pointing thing that mustn't be done, it's your role as customer. other point a loooot of thread was created for ask the increase of the reward on the leves or give us daily to do. sadly for now the only answer we did get was:
the leves are not means to be used for level up, but for give acces to play mode different than what you do normally. FATE and dungeon are means to be used for level up.

i think they have miss the point that fate have become ugly, mostly because of this news trend of the fate party (i have done some too) i don't find this...fun... i found it stupid and boring and choice any word that please you. i hope they will understand this and make us get more different way to level up. or they will have changed the monster party into fate party...