I'll take a shot and give you 4: 1. you propagate your genes 2. you likely have a backup kidney and liver for your old age 3. you have a human being that is

I'll take a shot and give you 4: 1. you propagate your genes 2. you likely have a backup kidney and liver for your old age 3. you have a human being that is legally required to help you out financially upon coming of age, 4. you have another person in your life that oxytocin makes you fall in love with deeply and unconditionally, and if you don't fuck it up, that love is reciprocated. Then again, it is a lot of work, stress and there are no guarantees, but it's still as stupid as to join/found a startup (lots of work, stress, no guarantees, it basically changes you) - the main trade-off being is that your child is more likely to grow up well than your startup will become a unicorn, but you can't sell your child for a billion currency units (and i can assure you, if you're not a sociopath or mentally ill, you will not want to). So there's that.