FWIW, I've flown with both the (former) investment banker and the dentist.
Neither are impressed and both are supplementing income with investment properties and locum work.
The investment banker (married, 2 kids) told me he was $14000 in the red each month; the dentist (single) already has a home in the Northern New Territories so (approximately) breaks even, not even close on his S/O income alone.
Food for thought.