When watching the Rose Bowl game this weekend I was struck by the division of the stadium stands based on the colors, red and purple, of the two teams playing. It was clear which team was offered which set of tickets and which, in this case Wisconsin red, purchased more. I found a similar picture online from a past Rose Bowl and the split pattern was the same, each collision of colors was located behind the end zone.
The seats behind each endzone are typically the cheapest and I wonder if more fights break out there because rival fans in cheaper seats have less incentive not to fight. If the split was at the fifty yard line on each side then those fans would be paying more to sit there and consequently have more to lose. Fans who paid $40 per ticket and saw their team losing in the second quarter might be quicker to anger and violence with a rival than those with the $100 tickets.