Marketers love re-targeting, and it’s a pretty natural, if misguided, instinct. This person bought something, or looked at something, they seemed happy enough about buying it, so let’s not let the party end without getting them to buy even more. We all experience it as consumers. Spend a few hundred dollars on a new phone, pick up all of the standard, relevant accessories, and there’s still no chance you’re making it to the exit door without getting bombarded with very special offers.