http://www.miami.com/mld/miamiherald/sports/soccer/13066899.htm Miami "The team, despite charismatic coach Ray Hudson and good results, had fewer than 2,000 season-ticket holders and very few corporate sponsors." I take this to mean that they did not have 2,000 season ticket holders in 2001 when they folded (and probably not in 2000 either). I already have the 1998 and 1999 numbers.
Bump There is a lot of MLS financial data/tickets sales etc. on various thread that should all be compiled here.