Yep your on the money there Bris!!
It cost a minimum of $250k to hire the joint for an event...so can understand why the entry list is so high at certain events and why others cost so much to enter with less traffic to hit up the mountain...
Plus they only get permission to use it so many times a year...
Why events like the Drive Days,FOSC & Bathurst 12hr (plus the V8's) are so awesome and worth going to if you can atleast once in your lifetime