Ask HN: Does money and idiocy have any correlation?

I've been noticing that the more money a company has, the more successful it becomes, the more dumb it becomes. There are a few exceptions - Apple - but those companies are rare.

What is it with money and market share that causes good companies to all of a sudden turn dumb?

It's getting to the point where I don't want my favorite startup to be a huge success because I'm afraid they will destroy their great product for some reason.