Quoted from too-many-pins:If it was a machine that he should of paid Robin for selling here on Pinside I would contact Robin because it isn't fair to Robin when someone doesn't pay their fair share. Not that it would help you resolve your problem with the seller but Robin might decide to block him from selling if he avoided paying fees and that way he might not be able screw someone else over in the future here on Pinside.
You just described every single Stern & JJP dealer that puts up F/S ads in the marketplace. One dealer shows 281 archived ads with only 1 sale.