99% of the game isn't at ilevel 330 (or 320). Endgame is not "the game".
Even in endgame content you shouldn't be in a random pug expecting everyone to be prepared to clear content above their ilevel. If you're not in a random pug, why aren't you handpicking healers who match your play style?
It's amazing that people will bitch and whine that players "ought" to be exactly as experienced, geared, and skillful as they are, while refusing to take responsibility for finding people who are exactly as experienced, geared, and skillful as they are.
If you don't like grouping with the dirty plebs then don't take the bonus pay from DF. It's pretty simple.