Alliance Raid, Normal Raid, Trials often having need of DPS...

Often Alliance raids when forming you get people on where you get both the extra reward onto DPS/Heals/Tank all in one as in collecting players... often queud in as DPS with bonus and then later on noticing Tank or Heals is needed in the same roulette type, but as you have put your ticket in, you will get additional reward over the 3 job types.