Carl,
$250 a seat if you want to sit on the floor, but when I looked yesterday there were plenty of seats left in the $55 and $75 sections. Not as close to the stage but with the video shows they put up on the Jumbotron monitors you don't need to be up close to get a good view of the show any more. I sat in the upper deck of Citifield (the new home of the Mets) and didn't feel like I was missing a thing.
But I agree with you, if $500 a pair was my only option, I would have stayed home too.
And by the way, I would say that Paul's voice is 80 - 90% of what it was. I have seen a number of aging rocker shows over the past few years where the vocals were downright poor, but this was not one of them. During the whole show there was only a handful of times that he didn't have the range to hit a particular note, but he worked around it and if you didn't know where he was supposed to go, you might not even have noticed it.