Prisoners can’t have CDs, they’re too easy to make into shivs. They don’t have Internet. So selling them cassettes is a lovely business. See also Boing Boing comments — cassettes retain their popularity in Saharan Africa, where CDs die of dust. The cassette: not quite dead!
The third comment on that Boing Boing article is, um, something. But I wonder: does there exist an opinion so ridiculous that not even a single “audiophile” will claim it?