Jack, I'd say it's not as generational a difference as it is a contextual one. (For the record, at 48.5, I'm not quite a whippersnapper anymore myself.)

Comparing any current event to something that happened 43 years ago is an exercise in apples-to-oranges. It would never occur to me to compare Lollapalooza 2011 to Woodstock when more apt comparisons exist in the here and now (e.g. Bonnaroo, Coachella, SXSW, Outside Lands, etc.).

That's how much live music experiences cost these days. In the old days, bands and their labels took a loss on tours so they could promote the record. Today, the paradigm is exactly the opposite. Recorded music is virtually free, but the live experience is what sells.