Recently, eBay has made it so that only the products with paid ads are shown in places where customers click. This drives up the cost of everything by more than 10% which is eBay's ad fee. I refused to buy a paid ad to sell my MacBook. It sat on the site for a month, which is highly unusual for an in-demand and rightly priced product. Finally I lowered the price enough to get it sold.
Most consumers use the default site, which filters by Recommended (i.e. ads) The play for consumers to win at this new payola ad scheme is to always filter by lowest price (or in amazon's case Prime + lowest price)
But really, consumers don't win (and neither do sellers) because now these ads take up space in supposed "search results" for items which don't match the search terms (but are close enough) This creates frustration when you are looking for something to meet a specification, like E26 light bulbs for example. Here, it is pointless to show anything that doesn't meet that specification and yet the site shows them, and the seller has to pay the ad fee.
Please somebody make a site with no payola!