From what i have seen over the years, healers hands down get way more than tanks or DPS.

Oddly, from my experience as well, i get more on my black mage than i do tanking, and i am a damn good tank. It keeps making me think i should just return to my 2.0 main of BLM and specialise in explosion magic once more. (I do not really get them on other DPS, only BLM.)