It's just a question of if you value other people existing or not. If you don't, focus on per-capita happiness, if you do then you focus on meeting a minimum threshold of happiness for everyone.
I don't see how you couldn't value other people existing – I think they have just as much of a right to experience the universe as I do.
Has that belief led you to a lifestyle in which you are just barely happier than miserable so that you can lift as many others as you can out of misery?
I don't see how you couldn't value other people existing – I think they have just as much of a right to experience the universe as I do.