That is rather interesting to think about. I remember last summer, going to Knoebels in the middle of July, and both Phoenix and Twister were only running one train. I thought I'd have to wait forever to get on, but the wait was always a surprisingly short one.
I think it's because Twister and Phoenix has no gates and no seat belts. So the operators can just check lapbars and dispatch the trains, and guests don't have to wait for a slow air gate to open, and half of them don't even know the right way to buckle a seatbelt (I've dealt with this many of times)