There's all kinds of fans at shows. Some, as you pointed out, still like to buy CDs and/or LPs. But I'm sure there are people there who like to listen to the artist on streaming only, and they will still go see the artist every single time. And not just young people.
The first show I saw was GN'R in 1991. I think my ticket was about $20.
/jarmo
Haha, I can guarantee it's not just young people. I'm getting up there in age now and try to see my favorite artists every time. But, like I noted earlier, I sold or gave away most of my CDs once I got a car that didn't have a player and went to Spotify. I'm like you, however, in regards to (uber) favorite artists: I will still buy hardcopy editions of new music, although, admittedly, some of it is more for display.
I saw them about the same year as you and my ticket also was about $20.