Can mercenaries be self-sufficient for rubies?

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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?
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How to get rubies in clicker Heroes Fast?
Rubies are the premium currency in Clicker Heroes. They can be obtained from clickables, mercenary quests, or by purchasing them from the Shop using real money.Mercenaries is Best Free to Play! Why Money isn't Worth it Right Now - Hearthstone Mercenaries Tips
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Images: ANTONI SHKRABA, Anna Shvets, Tima Miroshnichenko, Alexander Sergienko