I think that's the scariest thing really. That it might not be. Compared then to what every one who would consider themselves 'regular guys' would pull in, and then... D:
well, there's also the question of income expenditure.
if I quit my job but continued to live the same lifestyle as I do right now (middle class house, 10 year-old car, 1 big vacation/year, etc) I'm sure 10 million would do my fine.
but without work to occupy time, I'd probably end up occupying time via spending money (whether we're talking about spending money on travel, shopping, enrolling in university, or whatever) at which point 10 million probably wouldn't be enough.