Hmm, I wonder how much pent-up demand there really is for this? meglet makes a good point about why the fetishist might do this, but it looks like a buyer's market! I restricted my "worn shoes" search to completed listings, and the most recent ones were all trying to appear new, rather than "trashed" (that is, I couldn't find any sales which are only attributable to foot fetishism).
I wonder how much eBay makes on listing fees for unsold items in categories like (unwitting) fetish gear?