Dunno,
Your assertion was sufficiently dealt with above and I quote;
“These drivers have experience driving much more rowdy groups. (Think proms). It is actually responsible to use such an experienced professional driver. The slight incremental cost is worthwhile for safety.”
According to your logice they should go to a rent a wreck and get the cheapst shmattah car available. Who cares if the tires are bald and the breaks are soft. Turn signal are an unneccesary luxury and headlights, why those just waste gas.