It was like 40 or 50, but yeah the points stands, it was still like two orders of magnitude smaller than any other 10+ billion dollar exit we’ve ever seen.
I'd also add to this that you should be getting a decent base salary at a company at this phase and you should try and live below your means, both so you can save and have a cushion allowing you to work full time without outside funding and so that when you do the burn rate on that cushion is smaller.
I'd be more concerned with whether YC would invest in a company whose growth had flatlined: http://www.paulgraham.com/growth.html, with that said if you're making that much revenue I think there's likely other good options for you. Best of luck!
You can't do all these without roommates in San francisco (unless you have rent control pre 2011 or so) or Silicon Valley without roommates, but with roommates its manageable to a degree. Keep in mind "start up" can mean pretty radically different sizes with pretty radical mixes of base salary vs equity, later stage, bigger start ups (maybe more aptly, post product market fit, fast growing, privately held technology companies) can pay experienced engineers closer to $150k+ a year which even in an expensive area is a good amount of money. Even pretty small start ups tend to offer decent health care these days.