The draw of playing for millions of dollars in a single poker tournament is obvious, and the increased turnout for the 2016 World Series of Poker main event certainly speaks to that. But there tends to be a lot of down time in the early stages of any tournament, and even more so when a format like the WSOP's main event is in play.
For a long time, players did things like watch movies, listen to podcasts on their phones and tablets, or do more active endeavors like Open Face Chinese poker or online poker while they were at the table and out of a hand.