It seems insane to me that the happy path involves you getting $70k. Working in finance, I would expect that amount as a bonus in any year where I perform well and the business isn't unprofitable.
When I've spoken to people about the finance/big tech/startup trade-offs, we've often talked about the upside from startup success (outside of the Google or Instagram case) being around an order of magnitude bigger than that - in the 'pay off your mortgage' ballpark. Is this unrealistic?