Aside from providing revenue for the BAA, I can't see why the lead car has to be within easy sight of the lead buggy. That does assume that the judges can review all CMUtv's camera angles afterwards, which is not currently the case. The lead car does have the useful function of forcing non-buggy-aware people off the course, but the incident with the bike in the chute in 2008 or 9 shows the flaw with that plan: Either the lead car runs over the idiot cyclist, or the car stops and gets rear-ended by the buggy. Either outcome is terminal to sweepstakes.
As I see it, double bales have two benefits :
1) If properly staggered, a buggy can't go between them and hit the curb directly.
2) If you hit them square on, the buggy has twice the distance to go 35 to 0 in.
They don't prevent a buggy going under both rows of bales and hitting the curb without slowing down much. It seems like there are parts of the chute that benefit from both 1 & 2, and parts than need only #1.