100,000's Have. Some perceive registering as a greater danger to their personal privacy than the danger subjected to everyone else who has been trained to properly and safely use the NAS. People whom have no experience with the NAS feel there is no danger with 700,000 plus flying "toys" weighing up to 55 lbs flying all over the NAS. People who fly up there in manned aircraft would obviously disagree. Their lives are on the line. The UAV operator's is not. People are going to do "crazy" things with "toy" aircraft capable of flying right up there with EVERYONE else. Small birds have brought down big aircraft. There are rules and the FAA wants/needs a way to hold all UAV operators whom operate a "capable" UAV accountable. Now before we go down the path of someone steals my number. If someone steals your car to rob a bank, they don't arrest you. When the law is broken, an investigation proceeds, and usually the bad guys get caught. I feel the dangers presented from more UAV's in the air than there are certificated pilots in the whole country's IS a more important issue than worrying about someone getting your address. By the way, most aircraft owners do not use their home address to register their aircraft. They use a PO Box or the airport address where it is kept. Don't get me wrong, privacy is extremely important, just not at the expense of endangering other people's lives. It's seems to me too many are just disregarding that issue. They are just toys, leave me alone. That's not going to work. This is just my opinion, I could be wrong. Just saying.