That’s because what you’re searching for is what you definitely want, so they know you’re likely click/buy it. But if throw a bunch of crap that you maybe might want before you get to it, maybe you’ll buy some of that too. It’s like how supermarkets throw a bunch of junk food in a checkout lane, maybe you’ll get tempted while you’re forced to stand there even though you just wanted to buy laundry detergent.