First off, "spamming the training dummy" is not raiding.
Second unless you can provide us with solid evidence that you are in fact doing less than a Mage / Warrior / Rogue, then your point is moot.
Third, my guildie has parsed many of our runs through Expert dungeons with me as an Inquisitor and the logs have show that I've been doing significantly more than the Mage or Warrior on our runs. Especially when it comes to fights with adds or multiple targets.
If you think the grass is greener, you're more than welcome to re-roll.
(My Build)
Bookmarks