Yeah I've noticed that usually you need at least 4 people to quit before anything happens to the boss. Even if they know he sucks they're gonna try and keep him on. No idea why, but it has the appearance of "he's part of the mgmt club and you aren't"
Excellent point. I'm pretty sure this is a thing, I vaguely remember reading something about how getting promoted gives you some "invisible leverage" (my words) because now the company has decided you are valuable and special and they don't wanna look like they made a mistake.
Thanks, this actually helped me understand an instance of where several not very good managers got further promoted and it made no sense to me.