And that's doubly so when it comes to new material from these bands. Nostalgia for Duran Duran's Rio doesn't translate into wanting to buy and listen to a new album created by the members of Duran Duran at age 50. That's not how nostalgia works.
So, yes there's nostalgia, but no, you wouldn't expect it to translate to huge album sales. It's a niche phenomenon. What's the big mystery?
Nostalgia will lead people to buy tix to see a band, if only in the club venue. I don't think it will motivate to buy an album.
Santana was a marked departure from the rest as he came blowing back out of the gate with a fresh, clean sound and captured another generation. The latino thing helped too. Good for him.
I often go out and buy an OLD CD that I either never got back then or lost over the time. But I rarely buy new material from the same people.
Poison, for example. I LOVE their shows, they are among the best bands to see in concert of ANY genre. Even in their 40s they have an energy and a presence. Is the music cutting edge, innovative, or interesting? No, but it's a hell of a lot of fun. And back in their 'heyday' I wasn't a big fan.
That said, while I will throw on Flesh and Blood every once in a while, their new material sucks for the most part.