Average Attendance Stats courtesy of ESPN.
Cavs:
2010 (LeBron’s last year before leaving) – 20,562
2011 – 20,112
2012 – 15,926
2013 – 16,192
2014 – 17,329
2015 – 20,562
Celtics:
2010 – 18,169
2011 – 18,624
2012 – 18,624
2013 – 18,624
2014 – 18,107
2015 – 17,593
You would think that after LeBron left with some of those terrible teams Cleveland had that the attendance would actually be lower than what it was. In 2003, the year before the Cavs would draft LeBron, they were last in the NBA in attendance, averaging right around 11,000 per game.