I've shunned founding startups or working at startups for the last ~3 years, and instead worked 15-20 hr/wk usually remotely. Time is your greatest asset, personally and professionally. It's how you stay abreast of the great opportunities of our time. You need that freedom to explore things that pique your interest or move you. Founding a startup means becoming mostly blind to the other great opportunities, which is…
What about founding a startup to try to make big money and then have the time to explore things?
2) even lower probability if you're an opportunist as described (note that smart investors like YC actively avoid them).
3) large minimum years investment required, especially if acquired or acqui-hired, maybe 4-10 years, during which you suffer the opportunity costs I described.
4) just easier to explore and be open to the rare opportunities, while still making decent money, by doing something like consulting at low hours. From this position you can always do a startup if you see something great.