The issues do include the 400 foot rule but it also includes all the rest that the FAA and AMA are in dispute over. As I said in another thread, IF the organizers of an event work with the local FAA office, the altitude limit could be raised or waved, within reason. IF, on the other hand, the organizers just do what they want without consulting/working with the FAA, anything that happens to the organizers or contestants due to breaking the law will be on them.