What’s up with Male Chastity?

Male Chastity belt

I completely respect all fetishes. Even the ones I don’t understand. Are male chastities suppose to prolong climaxes? It seems like this would be hurt to wear them for prolonged time. I have had a couple people ask me if I’ve worn one. No I have not. I would try one on, for a few a minutes. But I keep reading that people wear them for hours and days at a time. I still get the occasional boner that’s unexpected, and this would hurt so bad. I definitely couldn’t sleep in one.

Male Chastity

So I guess my question is, what is the benefit of wearing a chastity? Or is it a humiliation thing? If it is, then I totally understand why a dom person would want his sub to wear one.