All the cheap tickets go quickly, olddude.
A few years ago(quite a few, in fact) show producers realized that they, the people who created and presented the shows, were selling tickets at regular prices to people who were marking them up when the show sold out and reselling them--
They sort of figured that, given they had done all the work, they should be the ones to profit, so they started selling premium price tickets. People buy them because, for them, a high price ticket is better than not seeing the show at all.
This logic is wasted on the folks who object to profit(who number greatly in the folk community), and, sadly, it is the sort of thinking that's kept a lot of very talented folk musicians working day jobs and playing on street corners.
And Gargoyle is right, like them or not, the Stones put on a great show. Also, when you pay the big bucks, you get to see the Stones show, but for $10, you just see the Stones, which is not the same thing.