Who are these people? People interested in discovering music as an artistic experience and expression rather than piece meal and as background fill.
First, the high era of "classic rock" (60-mid 70's) was characterized by albums, a collection of songs often carefully sequenced to express an artists/producers complete vision. This required listening to the entire record uninterupted. With the advent of the CD, it was convenient to jump tracks or sequence them to play in a personalized mix. Digitized music formats broke down the listening experience and made it a background activity of assorted songs. Consequently, listening became a facile activitity, something to fill the background with, requiring little attention.
Second, the digitization of music and the explosion of portable electronics, only promoted poor sound quality and, worse, promoted audio illiteracy.
The return of vinyl records is more than "retro cool", it is rediscovery and recovery of quality listening. To play an album, you have to put the needle down and play through the side uninterrupted. Jumping from track to track by liftng and repositiong a needle is inconvenient and hazardous (to the record) Second, a good analog sound system, presents the music with subtleties and layers often lost in the digitized music format. No costly car audio system or personal player can come close to reproducing completely what a thoughtful artist and producer recorded on a "classic era" album. Consequently, "listening sessions" as this link reflects is a structured opportunity for a deep(er) listening on a quality playback format that has been lost to the general public over the the last 30 years.
Yeah, I'm crazy...like a fox.