What percentage of sales do U suppose Quads ar of all the Manufactures Wholesalers Vendors and LHS. and anyone else concerned with this HOBBY/SPORT. Do U figure it's enough to where the Principles in this Hobby/Sport (Not just DRONES) will start Lobbying the congress / FAA to try and get a fair shake. But again Who, does flying near full scale, stadiums, airports, People and forest fires etc. Has anyone here flown flown any where but your local AMA Field? If U can say NO then why worry none of this except 400' stuff is going change any of your flying. If or Until the FAA has You Swear Under oath and sigh that U will not fly over 400', Nothing is binding.Adversary Circular AC 91-75a is just that Advisory and not LAW until it is made part of an FAR.