SCCA's policy is no drones over race events also. When asked over the rally safety net, I've been told no drones. As a long time volunteer marshall, I've stopped a number of issues including drones. I've also allowed them with the proviso that they not be flown over the stage. That usually then puts them over the crowd which creates a different risk. As a marshall, I tend to not detract from someone else's experience but won't hesitate to do so if the situation requires it.
The "pilots" I've talked to have told me the they have a low battery warning so that the machine can be brought back to earth before crashing. I do not know if that is a feature of only high end units or common to all. I'd suspect the the bottom end units don't have it. Then how an uneducated person tells high end from low end, I'm not sure. I'd think some feature are obvious- one doesn't want to risk a $250 camera with a $50 drone.
The problem then becomes why can that guy fly his and I can't fly mine. Check for the FAA registration ? I'd suspect that, much like CB licenses in the 70's and GRMS licenses today, most users haven't done it. I don't even know if the FAA sends back anything acknowledging the registration. Flying from an adjacent property would be covered by FAA policy but a bit by ours. Our paperwork allows us to "control" traffic on the road. I think the right-of-way in Michigan is a minimum of 66 ft from the center of the road. One then has to visualize 132 foot wide corridor in which the drone couldn't be flown. Possible but difficult.
As the use grows, I guess I can see a time when registered "media" would be able to use them but not the normal public. Drones can provide dramatic images and dramatic images get expanded coverage. Orange vest on someone with a controller? Numbers on the drone that correspond to the vest? I guess I can see that. Until further guidance comes, the blanket ban makes the most sense and is easiest to enforce.