Speaking of carefully curated junk mail, I feel like I'm the only person that actually uses both Valpak coupons and the coupons on the back of supermarket receipts. There's good coupons for local businesses in there!
To be fair, it is actually a valuable economic service to predict which ads will be most relevant to which customers. Assuming a rational consumer that is. An irrational consumer can be mis-served by being shown ads for things he doesn’t need, but a rational one only benefits from some third party making effort to locate ads they’ll likely respond to.
Advertisement is just networking for market information. It’s a problem when people get badly influenced, but that’s a corrupted side path. The default path is a person being connected with useful information that increases the expected net present value of their money. It changes the decision tree, and the new tree resolves to a higher expected value.
Assuming the decider’s ability to make optimal decisions on any given tree, of course.