because tech people don't want to start a lifestyle or low-growth business. they are reading about giga rounds, unicorns and hockey-sticks as well as the VC/PG propaganda on hackernews etc all day and think that this is the only way to do it.

they eat ramen for 10 years, often even believing in someone else's dream without substantional equity to match the risk/reward profile. meanwhile, the plumber next door who started his own plumbing business is driving a ferrari on weekends.