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I promise you the expected value of a monitor or TV after a GPU purchase is 100x higher minimum.

Your examples are many orders of magnitude below 1%. They know who already has returned a product, and instigating a return is not a profitable outcome. There are a very low percentage of people who would buy a card then immediately buy the same card for a friend/partner, but there are almost zero who would be instigated by an ad to buy a different GPU in that scenario. Of the people who would buy a card, be satisfied, then buy one for someone else, very few of them would do so because of an ad.

Ads affect behavior in enough harmful ways that I prevent effectively any exposure to them, but they're not actually magic. .0001% that they are exposed to the subset of the .0001% of people who are interested in buying a GPU for someone as a result of a personal purchase that wouldn't have done it without an ad isn't worth it. But people actually do buy related products.