Love is defined by selfless sacrifices that benefit the loved. Parenting isn't the only way to learn and increase the capacity to love, but it's the most available/common one God gave us. The incentive schemes all fail because they don't address the root problem that society no longer seeing value or reward found through sacrifice or suffering offered on behalf of others. My 3 daughters require more than I knew I was capable of but return so much more. Worth it even when it doesn't like when we lost our first child.