Empty Seats

Beginning late in the second quarter of the Rams game and lasting until game's end, there appeared to be huge numbers of empty blue seats in Carolina's stadium. I thought I was seeing things. But then, as I was watching parts of other games (I have NFL Sunday Ticket), it was the same thing -- acres of empty seats, even though the games were still competitive. These empty seats were scattered throughout the stadiums so people paid good money for them, so what's up? Did anyone else notice this?