I just clicked on one of my pre-set searches to do my morning eBay scroll. At the bottom of the first screen of results was a banner ad for PWCC. It, at first, made me think that there was only 5 listings coming up under that search. A quick look determined that there was the usual 6000+ listings with the first advertisement placed
IN the search results that I have ever seen.

Edited to Add: It appears that there is one banner advert per page of 200 listings. Me no like!