Well you better take on two jobs then I suppose. Sacrifice?!? I've heard having children called a lot of things but a sacrifice?
If you do not want or cannot to contribute to the most important objective (the very SURVIVAL of the society) you should pay MORE and not less!
LOL, I can contribute to society without having children. You consider yourself conservative do you?
Maybe you can, but why would you do it? And how? By accumulating wealth which will be passed to the state at time of your death? But who would care for you in the old age if other people did not raise their children?