Let's take a look at 2014...
Highest home attendance
League: 7,906
(April 13 v. Atlanta)
All: 9,364
(June 14 v. Red Bulls)
Lowest home attendance
League: 3,091
(May 12 v. Minnesota)
All: 1,851
(May 28 v. Brooklyn at Belson Stadium)
Average home league attendance
League: 4,835
All: 5,028
Well how about 2013?
Highest home attendance
11,929 vs. FTL (3 August)
Lowest home attendance
5,409 vs. CAR (12 October)
Average home league attendance
6,859
How am I way off? As for who shows up or doesn't... when has that mattered? Knicks, Nets and Yankees always "sell out" and how many empty seats do they have?
http://en.wikipedia.org/wiki/2014_New_York_Cosmos_season
http://en.wikipedia.org/wiki/2013_New_York_Cosmos_season
I think you're reading the charts wrong. They only had three solid days. One in the 6k range, one in the 7k range and topped out at 8,500. The rest were all in the 4,500-3,500 range.