Now that all Thursday Night Football games are being broadcast on Amazon Prime, we just didn't want to take a chance that we'd miss out in any way.
The only way to guarantee we'd see the games was to bite the bullet and sign up. I have other methods I've used that MAY work for Thursday night games but I don't know that for certain. If we don't like it we can cancel at any time but for now, at least we know we're going to see the games without buffering, freezes, etc.