Healer dps is unfairly boring

[SamRF]

Go roulette: adventurer in need tank.

Tank queues 20 minutes

Healer queues instant.

I demand my special reward for being green dps with heals.

I really don't understand this. Tank is always adventurer in need while I get near dps like queues as tank lately. Healer is almost always instant queue. Feels like it's rigged towards tanks, although I guess it's probably to do with what I've unlocked for that roulette. Still doesn't seem right to me.