It's quite difficult to compete with Google and their revenue/cash hordes when it comes to salary / total comp. Especially if you price the options at the last round's price and discount them some more. Imagine a well to do company of 2 founders (in SF/Bay Area) and a team of 3-4 others that raised a seed at 10m cap. They want to grow their team headcount to 15 and are busy hiring, running servers, etc. They can offe…
When you reach a certain point, say your mid-30s and you have kids your financial obligations can extend far beyond what people think is necessary to 'live on'. You have retirement contributions, savings for college, long term care for family (most people believe it or not, have to help their parents out at some point).