I know you're all mocking this rumor and concept, but use a little bit of imagination, and youd realize it might have potential. This is Apple we're talking about.
People 'get' what a TV does and what it is. What they dont get, is a little black box that might do X or Y. Apple doesn't even have to sell them at a profit- they can break even, the business model being making money on the future content that is sold, etc. Imagine advertising the TV in such a way to show the integration with iPod, iPhones, iPads. Hundreds of millions of people have these devices, so there's a market. Imagine turning on the TV, signing in with your Apple ID, and boom, all your photos/vids/etc are downloaded/streamed from iCloud. Imagine ads where the individual is controlling it with their iOS device, using multitouch etc, and seamlessly moving content from the device to the TV. By pricing competitively, people in the market for a TV might think 'why not' and just get the Apple branded one- even if they DONT have apple devices. In this case, it could be a motivator to add to the ecosystem, which at the end of the day is Apple's goal. To create synergy with their products, so as owning another will get you added benefits and integration. If they competitively sell an Apple-branded TV- it WILL sell-a lot.