Most jobs, even technical ones, truly do not require a Ph. D. This is just the market sorting things out. Why have zero (or negative) income to get post baccalaureate education if you can go work somewhere (for money) and learn on the job?
Physical and intellectual freedom are worth more to me than money.
1) A recent PhD with $40,000 to his name
2) A Google engineer who graduated from undergrad at the same time and has $400,000 to her name