Looking at the linked article, it would appear the cost of turf replacement is about 1/3 the size of the overage bonus each year (except 2012).  Does that match up with what you see?

Year    Overage     Turf

2011     60,653      25,000

2012    125,389     103,000

2013    321,172     106,090

2014    374,015     109,273

2015    398,153     112,551


So the thrust of the article remains correct, although the totals round down just slightly.  

Am I missing something?  Are there other costs you're referring to (or other revenues missing) that you'd like to share?