That sounds vastly oversimplified. So you’ve discovered that I’m into hiking/camping gear. That doesn’t mean I will never buy another piece of outdoor gear or that I have heard of every brand and product in that category.
Yeah but crowding out my browsing experience with things I’ve already bought you’re losing the opportunity to sell me other stuff I mightn’t have even thought about!
if you really are into hiking/camping gear, you probably know where to find it and at what kind of price, or perhaps you know you will actively search and compare when buying, so the ad is of little relevance.