Yes, because TV prices are heavily subsidized by ad systems installed directly on the OS and not reflective of the true cost of manufacturing. Good monitors still do not have this problem.
I have couple of big TVs for people to watch movies, play games. All hooked up to PC and disconnected from any networks. They're essentially dumb monitors. No ads at all.
Maybe they're also monitoring what you are watching making you part of the greatest Nielsen ratings group of all times?! Content producers and advertisers would pay a lot for that.