the one issue is it takes a certain type of player to be either a healer or tanking class. i don't mind healing, but tanking i cannot stand for example. i would rather be a ranged dd or healer. the problem is there's very few with the mentality that they enjoy to tank the mob or heal the group. it's more rare to find someone that enjoys putting others first in the healer role or main tank than it is to find someone that just wants to beat on things.