I was a zealous collector of records when we made the switch to digital audio. And let me tell you, there was a significant artistry to the thing: a vinyl record was a standardized work of art. Every album cover was the result of careful design, photography, layout. The inner sleeve oftentimes contained more art, or if we were lucky, all the lyrics we wanted to sing along with. The record label itself, a masterpiece of design. All the smells and all the feels of merely collecting vinyl--even without playing it--are indescribable today.

When CDs came into the market, they were horribly clacky and just clad in layers of tacky plastic. The album art was shrunken, misshapen... and the objects themselves stank of polycarbonate, rather than delicious vinyl. Sure, they sounded great and they lasted a long time, and maintenance was dead simple. But so much artistry was lost. I was still collecting lots of CDs when purely digital distribution hit us, but by then, the smells and feels and experience of collecting vinyl were distant memories.

And that entire experience may be why people argue for the technical superiority of vinyl recordings, and analog tube amplifiers. Because it was all self-reinforcing, and it all fell apart once the clacky, tacky, plasticky CDs took over.

Yeah, that's all part of what I meant by "a kind of retro nostalgia". People enjoy the experience of buying vinyl and of putting on vinyl records. I don't think there's anything wrong with this, for what it's worth. I'm just claiming that this is what's driving vinyl's popularity right now, rather than because people are turning to it due to music availability issues (which is much more of a factor for DVDs/Blu-rays right now).

There's a shitload of valuable vinyl records that don't have any art at all or even any cover. Paper and cardboard doesn't last as long as the record itself.

No, the reasons for this are entirely technical.