I make quite a bit of money without a degree and I work 30 hours a week as an engineer. Doctor salaries are not much more than what I get already so I'm failing

I make quite a bit of money without a degree and I work 30 hours a week as an engineer. Doctor salaries are not much more than what I get already so I'm failing to see how it pays more to be a doctor. I guess if all we're looking at is total compensation then sure they make more than me, but I put in way less effort to formal education and work way less.