HBO is a pay service station. One has nothing to do with the other
If we were talking about pay-per-view I would agree. But that is not the case and so I absolutely believe that they are related. Let me try to demonstrate my point.
I already know that many of the people on this board have seen episodes of Hard Knocks. And since Hard Knocks has never been in Miami, it means that non-fans do watch Hard Knocks. I realize that many people watched re-runs on NFL Network, but regardless of that you still took the time out of your day to watch another team on Hard Knocks.
Only fans of a team (for the most part) would order HBO just for the purposes of watching Hard Knocks. There are a lot of people that have HBO all year. Out of these people, how many of them will skip out on watching Miami's Hard Knocks because they are already pre-occupied with other programing (in this case, the Olympics)?
My feeling is that there are a lot of non-fans that would have watched Miami's Hard Knocks when nothing else was on TV. And that these people will be watching replays or recordings of the Olympics instead. Dolphins fans with HBO will obviously watch Hard Knocks this year even with the Olympics eating into their TV time, but others may not make the effort to watch both.
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So far, the sentiment on this board is that there will not be an affect on the ratings for Miami's Hard Knocks. I disagree but can absolutely accept the viewpoints given here and hope you are right because I hate to see something reflect badly on the team when it is actually a matter of coincidental timing.