They aren't destitute, sure, but they really aren't paid that well either--judging from the other comments in this thread, a junior banker gets $150k for 100 hrs/wk of work. That's equivalent to making 60k at a 40 hrs/wk job; entry-level software engineers can (they certainly don't always, but can) clear twice that.
Although, working 100 hour weeks definitely helps you save the money you do earn--since you never have time to spend it.
Although, working 100 hour weeks definitely helps you save the money you do earn--since you never have time to spend it.