I believe that they invite guests based on the likelihood that they will present a spectacle.
Personally, I find that actual life has enough of that that I don't need to watch TV for it. But then Reality TV is a cheap way to present entertainment without having to pay for serious creative talent.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.