I agree that cassettes are picking up in popularity, that was the whole point of my post. You're simply selling a collectors item, not the music itself. No one that actually cares about the music will listen to it on cassette, it'll be MP3/CD/Vinyl. It's much easier for an artist to put out their music on CD than cassette. The only reason to put anything out on cassette is to fit in with a new, terrible trend. Who even has the ability to play a cassette anymore? Might as well just sell a keychain instead of a cassette.
Tape actually has better sound quality than vinyl. But, it's all moot anyway if the recording is done on a computer.