There's the Tacoma Dome thing that I remember reading about.
As I recall, the rental agreement for District Convention stipulated that the attendees not be charged for parking. Greed and arrogance took over and - as is done at all DC's - the delegates paid for parking passes via their local Kingdom Halls.
Here's a link to one of the threads on the subject: http://www.jehovahs-witness.com/7/136564/1.ashx
It was a small scandal but still something to ponder.