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The thought I've heard floated before is that you might not be happy with your new vacuum you just bought. Some percentage of people that buy anything will not be pleased with the result and that new ad in their face might be enough to push them over the edge to return it and buy what is advertised. Amazon just wants to ensure you buy the replacement from them.

Well, amazingly, Amazon also has data if the buyer is a crazy returner...

Sometimes its a third party seller running the ad; Amazon is making money.

I've been getting the same exact thing from Amazon for a month now... I already bought a Miele from you Amazon, you should know I don't need another.

I think I can do even better, Amazon served me ads for a product that I sell on Amazon. In fact, they were advertising my exact offer, to me!

Like come on, I just sent you a bunch of these!