I have a promo CD single to sell, and on E-Bay, someone is offering the same disc for sale at £500 for a used copy. Mine is un-played, so in theory is worth more.
I can see that the seller is a company, so maybe they simply leave the ad there for ages until someone comes in for the item, but can they seriously expect a price like that, or am I missing something?
Someone can ask what they like, it doesn't mean that's what the market will pay. Better to get a price from a specialist auction house that does music or popular culture related sales.