I've seen a lot of threads saying the same thing in another forum and, in a nutshell, it comes down to the AMA home office is panicking. The AMA Executive Committee is trying to force everyone that flies anything R/C into being required to join the AMA. Unlike NAMBA and IMPBA, the AMA is on the verge of financial collapse due to spending an ungodly amount of money on a bloated home office staff, pet EC projects that don't benefit the majority of the members and just plain wasteful spending. Their legal/negotiating team has done little to nothing to prevent Congress and the FAA from putting regulations on anyone that flies R/C due to the uncontrolled nature of the multi-rotor "drones" and proliferation of camera equipped "beyond-line-of-site" RTF aircraft. This isn't going to affect anyone that doesn't fly and really only affects those that fly "illegally", meaning above the altitude limits set by section 336, within restricted flight areas and, in general, those being a menace to others.