If the arena rock artists of yesteryear can still command ticket sales and put on a show that people want to see, I say go for it! People in the 50s think that people in their 20s look ridiculous bouncing around on stage, and people in their 20s think people in their 50s rockin' out look ridiculous. That's just a function of human nature.
Regarding pricing of concert tickets, the Interwebs are to blame. Back in the 90s, touring was a loss-leader, and some acts that had super-successful album sales wouldn't even bother to tour (e.g. Shania Twain with her breakthrough album). Touring was basically just an advertisement for the band. Sometimes labels would even subsidize a tour for a new act because they knew they'd make the money back with album sales.
With the legs cut out from under the music business in terms of sales, the costs of tickets have skyrocketed. It's all switched around now: the album is the loss-leader for the tour, merchandising, and licensing.
I miss the days of affordable concert tickets. However, I understand the economics that are driving the trend.