perhaps that's a reasonable analysis, but you are working from the assumption that you're able to "just join the right startup". i doubt that it is realistic to think that you have much control over it turning out to be "right" or not.
if you are able to earn $150k / year from consulting in a relatively small fraction of your time (incl. the overhead of networking, etc), that frees you up to use the remainder of your time on other activities, perhaps profitable or something else you value.
some ideas: start your own startup, start your own small business, focus your energy on building a diversified investment portfolio, buy and renovate a house to sell, plan and run a series of workshops, start your own hobby farm, spend more time with people whose company you enjoy.