Because there is a big deal made over it and people are curious to see what the big deal is.
Having lived in Ireland for quite some time, there is zero attention brought to the NFL during the regular season. However for the Superbowl there are commercials on TV and there are always articles in newspapers and magazines involving the SUperbowl.
Also this is less of a factor but over here, regular season games can only be viewed by more expensive cable packages. Where as the Superbowl is shown on a lot more basic channels and thus has an even wider audience.
I'd love to know what everyone here thinks the number is?
A frequently-misquoted figure from NFL press releases has led to the common perception that the Super Bowl has an annual global audience of around one billion people. In fact, the NFL states one billion as the game's potential worldwide audience – i.e. the number of people able to watch the game. Independent studies suggest that the average global viewership is just over 100 million, the vast majority[quantify] of whom are U.S. viewers. This is comparable with the final of the European UEFA Champions League  making both the most watched annual sporting events (both the 4-yearly Olympic Games and FIFA World Cup exceed this total).
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