I'm an ACO member and applied for camping at Tertre Rouge in December 05 for the 2006 race.  ACO put me on the waiting list for Tertre Rouge and guaranteed me a spot on Bleu Nord.

I ended up buying a Tertre Rouge Camping pass from Just Tickets at quite a bit over the face value.  When we arrived at Tertre Rouge we found that the guy next to us had bought his camping ticket on the day (Wednesday) from the ACO office at Le Mans.  Not only that, they gave him a full choice of camp sites!!  So again , what's the point of being an ACO member?