By your math, the janitors are worthless. Fire them all, and give that money to the devs! Then, as the garbage piles higher and the weird smells ground into the carpet linger, you can keep yourself warm with your extra money.

Also, why shouldn't the investors get their cut? They were forking over their money to pay you before a line of your code ever hit production; going by your math, developers should be paid on contigency of the code they write getting into production, and penalised if there's a regression.