What happened in Edmonton?

According to this site, the attendance for the Edmonton/Stamps game was only 21,147. That is one of the lowest attendance levels in the league this year. It is almost 15,000 lower than their average and this was for a rival game. Anyone know why? I checked the weather and it wasn't that bad. I guess it is just surprising for the Esks, thats all.

My guess is that dissatisfied customers tend to not buy tickets. Edmonton and Winnipeg have declined the most and won 4 fewer games than in 2011.