[ethbro]

He's risked far more than most investors, including bailing out his own companies (SpaceX and Solar City) by taking personal loans against his stock in others that were doing better (Tesla).

If he hasn't infused the cash, SpaceX at least would have failed. There were a number of finance articles about it at the time "questioning" the odd moves, but paraphrased from Musk, 'If investors are risking their money, shouldn't I be risking mine too?'

If your metric for "enough" is "work to literal death" then I expect you'll continue to be unsatisfied.