Obviously they sell records, as much as any band does nowadays.
Obviously seeing Alice Cooper, Joe Perry or Johnny Depp. They're tapping into three different fanbases right there. Just because YOU have no interest doesn't mean others don't. Obviously they do as they often fill arenas.
Obviously that is just your opinion. Just as obviously not every one agrees with you.
When he's finished having more kids?
Quite possibly, considering how much the VIP packages go for.
Did you known the profits from a fair number of shows is actually donated to local charities?
I honestly don't think it IS about the money, at least for the main players. It's not like they need more money. They're having fun doing it so why shouldn't they? If people aren't interested they won't go. Obviously that isn't happening.
Again you are coming from this from the "I'm the only one who is right" angle. If the band is enjoying it, and enough people want to pay to enjoy it, why shouldn't they carry on doing it? And what right do you have to say they can't?