Inclusive fitness theory delivers a clever solution to the problem of altruism, especially the case of sterile worker castes in social insects. The idea behind the inclusive fitness theory is straight forward and contemporary: if you can somehow outsource reproduction, then you may reduce (or stop) personal reproduction. You do not have to copy your genes yourself if somebody else can do it for you. Just who this somebody else should be, and how much you should be willing to pay for it, was famously derived by Hamilton [1,2].