Too right
If you have the time, and the local branch of MegaMart hasn't taken them all out, along with a host of other useful specialist retailers that lost their business because they couldn't by for what MegaMart sold for on the top ten best selling products. Amazon have only completed what MegaMart started.
It's worth remembering Tesco's clubcard knows more about you that the government, and should Amazon or Google get that information, well you can guess how much more product spam you'll get.