Opportunity has a LOT to do with it. And a lot of the high income-earners I know we're extremely lucky, knew the right people or were in the right place right time to get their major opportunities in hard-to-get-into fields. And pretty much all of them had support which in my experience is crucial in order to achieve these things.
Likewise some of the hardest working people are the lower income earners. And yes there's bludgers in all walks if life too who really do have an attitude of entitlement none-the-less.