Because your status is temporary. As long as you have to work for a living, you're vulnerable to whatever 'the market' does.

Additionally, regardless of how overpaid you are, you cannot isolate yourself (to the extent of how billionaires can) from the effects of extreme wealth inequality. These are too many to list in a hn comment, but to give you an example, if a mob turns violent, you'll not have a security detail to evacuate you and your family.