The teams this year reaching 10,000 in full-season-ticket sales are the Boston Celtics, Cleveland Cavaliers, Los Angeles Lakers, New York Knicks, Oklahoma City Thunder, Orlando Magic, Portland Trail Blazers and Utah Jazz.

The Lakers and Jazz have made the list for three consecutive years, a nod not only to their strong on-court performance, but also to the strength of their sales staff.

New to the list this year are the Cavaliers, Knicks and Magic. Dropping off the list are the Chicago Bulls, Dallas Mavericks, New Orleans Hornets, Phoenix Suns, Toronto Raptors and Golden State Warriors.
Sports Business Journal

I think the economy has a role to play in season ticket sales. Ontario has been one of the province hit hardest by the recession.