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.
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She sits in her corner, singing herself to sleep.
Wrapped in all of the promises, that no one seems to keep.