I've started going to car boot sales. Most of them are disappointing but I usually manage to find a few bargains to justify the trip.
The other week I found a 1964 paperback first edition of a Salinger novel and bought it for 30p. I put it up for auction on eBay for a modest starting price of 99p, then sat back and waited for the offers to come in.
Seven days passed and nobody wanted it. Not even for a under a quid. I've sold all sorts of books on eBay - many of them far more obscure than this one - so why didn't the Salinger find any takers?