I think most parents would prefer to spend time with their children but can't afford to. Both of them need to work to pay the bills. Outsourcing is the only option.
In Australia, the cost of fulltime daycare is around $800 per week. That's often the entire take-home pay of one of the parents, especially if they're only working 9AM-3PM.
Most people aren't doing it to earn extra cash. It's so they don't "lose their place" in their career. Time out of the workforce is a killer for career progression.