Why would I want to give the ad networks additional information and make their advertising more efficient? Given they exist, I’m perfectly okay with advertisers wasting money on badly targeted ads.
Then again, could be fun to screw with them a bit. I wonder what would happen if you just kept clicking I already bought this on everything that pops up. Or better yet, just write a script that clicks it every time one of those ads appears. I wonder if it's possible to go through every single item they advertise and what would happen if you did.