I suspect ego is the dominant driver. Most folks think they have the only correct take on reality and since they decided this is right for them it has to be right for everyone else… and as I have said before, anyone earning more money than them, or just willing spend it are ignorant, stupid, or shallow. It’s all about them being the center of the universe.
Keeping ego out of things is hard. It creeps in in small, medium, or large doses depending on the individual.