Even if it's something you want, if there is competition in the space, then since Internet ads work on a real-time auction system, you can expect that the winni

Even if it's something you want, if there is competition in the space, then since Internet ads work on a real-time auction system, you can expect that the winning bidder is the entity that has the most available margin to make. i.e. it is the worst possible deal for you the customer. So e.g. when you search for something on Amazon and see sponsored results, you can expect that those are the worst possible deal.