Apart from the above reasons, there's a rather large ( i think ) group of people who have invested ( rich gits ) thousands and thousands in top flight decks, outboard phono stages, snake oil cabling, separates amp/preamp, decoupling hifi supports and so on.
Could easily top a couple of hundred grand. Ok, they're the rare group, but the lower orders could easily reach 10k. I would be buying vinyl now it's back, if i ever owned such a costly vinyl sound system.
Mind you, even CD sound systems got to giddy heights. 20, 30k for CD transports and so on. I remember some top flight Onkyo amps costing 30k. And Barclay CD tranpsorts costing as much