Stop queuing for PotD if you don't intend to DPS at all.

[VanilleFang]

they don't pay for their subscription.

I pay for my own subscription. If someone can't be assed to bother to play even half-decent it's not worth my time and money.
If you think it's worth your money to hit 1 or 2 keys then fine, but don't waste my money.

A healer is never a detriment to a team because they heal, try doing stuff without one

That's the same as a tank who thinks they are irreplaceable. I've done stuff without a healer before. They aren't all godly and to think that they are the most required role in the game is not only incredible self centered but also a complete misunderstanding of how the game works.