You don't have kids because it's too expensive.
I don't have kids because I'm immature, irresponsible, would screw it up like everything else in my life, can't even take care of myself let alone another human, these genes aren't worth passing on, climate change will almost certainly never be taken as seriously as it should be, and it's not like there's anyone that would want to have my kids anyway.
We are not the same.
And also it's too expensive.