> This is the conclusion of utilitarianism, where if you have N people each with 10 happiness, well then, it would be better to have 10N people with 1.1 happiness, or 100N people with 0.111 happiness, until you have infinite people with barely any happiness
1) Population isn't infinite, you can't continue this for too long
2) Your assumption completely depends on how costly it is to increase +1 happiness and to increase +1 user, you don't even mention it. And these costs are not fixed, it increases, so even if it is cheaper to add +1 user in the beginning, it will not continue to be cheaper indefinitely
So, nothing is preventing you from increasing happiness at the same time you increase users.
1) Population isn't infinite, you can't continue this for too long
2) Your assumption completely depends on how costly it is to increase +1 happiness and to increase +1 user, you don't even mention it. And these costs are not fixed, it increases, so even if it is cheaper to add +1 user in the beginning, it will not continue to be cheaper indefinitely
So, nothing is preventing you from increasing happiness at the same time you increase users.