I heard it is that Bentley were basically told not to by the ACO in case it ruined the cracking battle for 5th/6th/7th between the Gunnar Jeannette Panoz, the Lammers Dome and the Gounon Courage. Also there is a rule now regarding the time allowed for the last lap to prevent the unbelievably long drawn out maxxing of TV exposure that Audi orchestrated a year or two back.
Also, remember the GT class battle that was ruined by the formation Audis back in 2000?