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Of course for legendary game like Dwarf Fortress it doesn't make sense and it much lower, but for normal indie game 30% is not a limit so most of developers get less than 50% of sales after Steam and publisher cut.

Usually % that goes to a publisher depend on stage of development, risk publisher taking, whatever you give up your IP and your agreement on recuperation. E.g. if you keep your IP, but publisher cover most of development costs after prototype then they will likely take up to 50% after Steam cut.