eBay and/or AdWords seem to have gotten somewhat better at this. Used to be you could try some of the strangest, most surrealist searches you could possibly think up...I dunno - off the top of my head, um: words like 'ungulates', 'groping', 'derangement'. And sure enough you'd get eBay adwords ads saying: "Looking for derangement? Find it on eBay!". Lately, at least, that kind of extremity/absurdity doesn't seem to happen quite as much. Seems they've refined it out a bit.