I own a tape deck I bought last year...pretty high end new model (like the only ones you can buy at this point are from the same company). Has a crazy amount of extra features, remote, twin decks, etc.
I bought it because of the booming cassette culture scene that's been going on for years and I now own hundreds of cassettes, mostly tape level stuff that I enjoyed thanks to previewing the material on BandCamp or cassette podcasts/web sites. It's a fun format and sounds pretty good. For what it's worth, my R.E.M./Replacements cassettes sound considerably better than my MP3s of that material.
But yeah, in general the format is kind of dead, even with Cassette Store Day. People are certainly intrigued by it. It's a very fun format like anything analogue and it leads to the coolest looking physical items (seriously, these tape labels do incredible jobs in terms of the artwork). The problem really has to do with the lack of players (vinyl had the same problem up until very recently). There's literally no actual functioning portable cassette players out there to purchase new anymore. Most people are presumably just buying cassettes to support an artist they like. What's six bucks to them if they get a free download with the cassette?
I nabbed the three record store day releases I wanted from this weekend. Phil Spector (via BulMoose) and Lee Hazlewood & Afghan Whigs (via my local record store).
Also, it's fucking hilarious how this BullMoose chain in Maine often has literally every Record Store day item after the weekend. Maine clearly doesn't have much of a hipster scene, I guess. For example, the Guardians of the Galaxy cassette is going for almost thirty bucks on Discogs. If you live in Maine, you can purchase that tape in-store for under nine bucks.