You can also buy first-party stuff from iTunes on your AppleTV without any other device; maybe you need to have used a computer at some point in the past to mak

You can also buy first-party stuff from iTunes on your AppleTV without any other device; maybe you need to have used a computer at some point in the past to make the Apple ID, but it certainly isn't an ongoing requirement to own anything except a TV (as AppleTV isn't actually a TV, despite the name ;P), and having an Apple ID is probably also required to download even free apps from the App Store.