As a customer, you will try of course to get the best deal. The best deal for you is the worst for them, so the target of advertising is convincing you that you

As a customer, you will try of course to get the best deal. The best deal for you is the worst for them, so the target of advertising is convincing you that you are getting the best deal while actually giving you the worst possible. Targeted advertising is not giving you better deals, but providing you with a greater mismatch between your expectation and the reality. You may get a better deal out of it, but that is an unintended side effect