That's a relative bargain compared to what Aerosmith and Kiss were charging for their tour last year (and no, I didn't bother). Not only were they charging over $100 for any decent seat at most shows, KISS was selling fans on special seat packages (some with backstage access, granted) ranging between $250 and $1000.
I paid $45 each for front row to KISS a couple years ago on their "farewell tour" (which I suppose was accurate since that was the original four, not the Tommy Thayer version of last year, or the Tommy Thayer/Eric Singer version of this year).
Event ticket pricing has always been based on the "how much can we get away with charging" philosophy. And I think the culprit recently has been the success of those "classic rock" bands that are touring arenas, sheds, state fairs, casinos, zoo amphitheaters, and any other house that will take them. You've got Journey touring with a Steve Perry soundalike selling very well the past two summers. You've got Tommy Shaw and James Young touring a Styx-branded product that doesn't even play the Dennis DeYoung hits and they're doing fine.
If they can sell people at $30-$40, Van Hagar should do quite fine at $55-$88.
Van Halen will do just fine with thier ticket prices, I just wont be one of the people buying one. KISS and Aerosmith can get away with it, because, they can sell $50 tickets on thier own, so BOTH bands are theoretically worth a hundred bucks.
Most glaring omission: Chuck Berry. Here's another take on the same idea, which has a lot of overlap but puts a Chuch Berry classic album in the top ten: http://www.digitaldreamdoor.com/pages/best_rockguitalbddd.html