the people who are really getting ripped off are the people who pay google for my information. Let's say I buy guitar picks from musician's friend. For the next 3 months or more I get pop-up ads for guitar picks. But... too late! I already bought them!

One advantage of being spied on is that the ads I get are usually geared toward my interests. And I have actually gotten ads for products I didn't even know about, but I liked the product enough to buy it after I saw the ad.