That's true about the GPS tracker - although, I'm just thinking for safety, first and foremost. Safety of people AND the copter. If a prop breaks in flight, it would be nice if a parachute would open on the way down. On a flyaway, you'd need GPS to find it most likely, but then again, I'm guessing on a fly away, the direction would be straight up - or maybe not - I've never seen one or actually heard of one... other than someone's copter returning to home while it was in their house or something.... or what happened to me, I had a turnigy 9x with default firmware and there was a bug that caused it to send half throttle for a couple of seconds to the rx when it was powered up. I forgot to disarm the board and turned my tx off, then turned it back on before it automatically disarmed and I had a "fly away" into my ceiling =) Not fun.
I just figure with all of the great minds designing stuff around quads, they'd be able to create some kind of a parachute that knew when to deploy (and was light weight) and has some kind of a system so you could track the quad down... or use telemetry/OSD with a GPS unit, like the frsky stuff.
That's the other thing that sucks too. When I got into the hobby, I thought the money would be the big concern when adding features, but now that I have a lot invested, I'm usually more concerned with the weight added when adding things to my copters.
All those rules are great, but every craft is different, so I think the real rule is to just start out slow and ease into things before you start pushing the limits.
I heard about the sac park flyers when I started, but I forgot all about them. I just checked out the site and there is a ton of activity, and a lot of the recent stuff is about multirotors. I didn't realize how many people were into the hobby around here. Do you fly with them? If so, are the events pretty cool? I've actually never flown anywhere with any other RC craft in the air. If I fly with my only other friend who has a quadcopter, we don't ever both fly at the same time because it seems somewhat risky - especially with FPV since we don't have a 360 degree view around the copters with our goggles on.
I typically either fly on my parents' property since they have some land and all of the surrounding properties around them have quite a bit of land.... or either by myself, or with my buddy, we'll drive around and scope out parks that have a lot of space and don't have anyone around. When me and him started flying, we would just go to any old parks near our houses, or fly in the neighborhood, but we quickly learned that you end up spending more time answering people's questions than flying.... and the worst thing is when people you've never met before ask you if they can try to fly your copter, or they want to put on your FPV goggles while you fly to see what it's like. I'm all about sharing the love, but I think it's pretty peaceful to fly, so I usually don't like all the attention - plus it takes up hours of time.