Why are low standards for dps acceptable?

[Fyce]

How would you feel if I as a healer just wanted to afk behind the tank and let my fairy heal? Obviously any sane person would have a problem with it.

I really wouldn't have a problem with it as long as your fairy didn't let us die.

Double standard.

If a DPS is underperforming, the whole team will stay in that dungeon for longer.
If a Healer is underperforming (and let the group die), the whole team will stay in that dungeon for longer. (Repairs are completly negligible.)

So, back to square one, the title of this thread.