In Clicker Heroes, the newly added mercenaries have a chance to die on each mission they're assigned. Resurrecting them costs rubies, the amount of which is based on the level of the mercenary.
I have a set of 5 level 1-5 mercenaries, and even though I try to pick missions that reward rubies as often as possible, it feels like a huge ruby sink.
Do mercenaries ever get self-sufficient for rubies as you level them up?