They make great paperweights. Or cut the cord and use it as a cage decoration. Not much else.
It's the same reason why cedar shavings are still sold as small animal bedding. Or that dry crud in a jar is sold as tortoise food. The industry will try to sell anything they think they can make money on, and many people simply don't know any better.
She sits in her corner, singing herself to sleep.
Wrapped in all of the promises, that no one seems to keep.