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>Ads like this are very common for me - a purchase that I would consider to be a one-off thing (at least, for several years, whatever the standard lifetime of that product is) just leads to more ads for different models of that same thing. Occasionally, accessories that only go to a different model or brand of that thing.

I don't have the industry expertise to know how true it is, but I've seen it stated numerous times in threads like this that this is entirely intentional. Supposedly the data shows that a person who just bought a rowing machine is actually quite likely to buy another one (because they aren't satisfied with the first one, because they collect rowing machines, etc) compared to most other demographics.