I'm sure we all want the best jobs we can get and that people go into dentistry for the same reasons they go into medicine and law - it's something they have a flair for and that can earn them a reasonable salary, and with seven years' of hard slog behind them I don't blame them. There are easier ways of earning the same money as a dentist earns (for instance, there's a rather classy-looking 'gentlemen's retreat' round the corner from my dentist and afaik you don't need a degree to work there).
I've got a couple of degrees and have a flair for teaching, but my job and salary don't reflect that. I'm not complaining - it's my choice.
Oh, and one thing you do learn from a graduate/post-graduate education - as your wife will no doubt tell you - is to clarify claims before presenting them as evidence. No-one ever had a dissertation passed on the basis of what someone heard.
My dentist certainly isn't in it for the money. She doesn't take private patients and our area is pretty poor. As I've said in another thread, if she's presented with a challenging case, she'll rise to it. She could just whip out the tooth and be done with it and s*d how it affects my saxophone playing, but instead she'll try every treatment she can before it comes to that - and I don't pay a penny extra for that.
I'm sure there are plenty of grafters out there on minimum wage who think that electricians/plumbers/plasterers/decorators etc. are onto a good thing, charging phenomenal rates for shoving a few bits of wire through a floorboard or mending a hole in a ceiling. I'm sure you'd be among the first to jump up and justify your fees. It's all relative.