Creepy EBay stuff – what's so gaily interesting about smelly trainers?

I like browsing through the “Other” section of EBay, because it brings to light interesting stuff such as male chastity devices. Today’s bizarre find is even harder to understand. What, really, would be the gay interest in smelly trainers, especially scally ones.

Enlighten us, but don’t make us go too Eeeeeewwww!