Yes, it is closer to $17k USD for an actual custom chair that will meet individual needs (which can't be bought on amazon) instead of a one size fits most kind of thing.
The customization is actually incredibly important for quality of life reasons, because it isn't just physical measurements, but also things like proper weight distribution tunes to how the person sits in and uses the chair. Sure, you can get a chair for $600, but there is a non zero chance that the throttle will be touchy and the balance will be off, sending you backwards onto the floor every time you move.
The song is... fine. It was overplayed on the radio and has a horrible reputation among guitarists due to it being something anyone could learn to play in a couple of days. That's where the "puts capo on the third fret" meme comes from.