Originally Posted by PimTac
It was a piece of furniture.
I think that has a lot to do with it.
Over the years, people became less accepting of audio equipment that was furniture.
Compare bookshelf speakers of today to bookshelf speakers in the 1970s. Oh wait, you can't because there were no bookshelf speakers in the 1970s! Look at something like a JBL L100. Back in the day, it was considered a "bookshelf" speaker. They're 2 feet tall! They also cost $275 each in the mid-70s. That's about $1,200 today.
There are a lot of really nice speaker options for $2,400/pair today.
That's the second part. People were willing to pay more for audio equipment 40 years ago. You almost had to. The whole idea of mid-fi hadn't been invented yet. My home stereo is made up of B&W 684s and a modern Marantz integrated amp, which together, amp and speakers, clocks in at far less than $2,400.
Finally, the music was different. Speakers with paper-cone woofers, mids, and tweeters sound great playing The Moody Blues and other instrument-based music. Daft Punk may be a different story.
On top of that, so many manufacturers have re-launched their old products. Klipsch still sells Klipschorns and JBL relaunched the L100 as the L100 Classic. You can buy the speakers you loved back then, brand new today. I think manufacturers have read threads like this though and are totally ready to capitalize on the rose-colored glasses of yesterday's equipment. Those JBL L100 Classics are $2,000/each. They're still not bookshelf speakers either.