Earlier quoted context omitted.
This is usually resolved by requiring a minimum ownership stake for each prospective board member, and to make sure it represents a significant fraction of their total net worth. To guarantee that the board would lose their shirts if they make decisions completely opposite to reality, thus motivating a more thorough investigation of what they see and hear.
Sounds a bit like buying a commission, by having enough money you proved worthy of it.
There was another post on HN a few weeks back with an article that looked into it and the numbers were really staggering.