Well they charged lots for events like this in the past, such as the Borgata shows, but then toured shortly afterwards and ticket prices were lower again.

I don't know about elsewhere, but I think that here in the UK, given that they play in stadiums of 50,000+, they'd never sell out shows if they charged these prices, which the promoters know, and which is why they don't charge so much. The standard admission tickets for the last few tours have, I think, been around £30, with gold circle ones being a bit more - and I don't think that is expensive, though that can be a personal opinion.

As I and others have said, the reason these Jersey shows are so expensive probably has nothing to do with Bon Jovi and everything to do with the people who built the place wanting to get a bit of money back on their build.