I read some fun MLS attendance stats today comparing this season to 2005 (10 years ago).
Average Attendance:
2005: 15,112
2015: 21,550
Median Attendance:
2005: 12,619
2015: 20,018
% of games under 10,000:
2005: 27.1%
2015: 0%
% of games over 20,000:
2005: 17.7%
2015: 50.3%
The most important number to me is the median. Years ago, MLS used selling tactics/gimmicks to burst attendance typically related to concerts or huge double headers tie ins, where the real attraction was not the MLS game. This is why there was such a big gap between the median and attendance back in 2005.
Now a days, those tactics are no longer needed and as such the median and average are much closer in line % wise.