Is there an idiom for this?

When someone asks for something ridiculously difficult or labor intensive, with no real gain from it aside from "i want it/thought it would be cool" I know "asking for the moon", but thats about something that is literally unobtainable, not something that is obtainable but insanely difficult for... show more When someone asks for something ridiculously difficult or labor intensive, with no real gain from it aside from "i want it/thought it would be cool" I know "asking for the moon", but thats about something that is literally unobtainable, not something that is obtainable but insanely difficult for little to no payout
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