I feel that there are quite a bit of factors that may attribute more to this. In my beginning years, I had a real problem with this during hunting conditions. Mostly due to adrenaline and buck fever setting in. Today, I don't have the problem and have shot fine with a normal TM style or bodoodle rest. I just like the added security of knowing its gonna be hard to get the arrow off the rest if I bump it or my arrow catches on something etc... you know what I'm talking about.

I think JoshKeller hit it pretty squarely. Harsher, more jerkey draw curves, shorter ATA probably attibute to a lot of it. Also, maybe people are drawing too much weight than they realize causing them to "yank" the bow back instead of steadily pull smoothly. Lighter, shorter arrows may have a more difficult time staying between the prongs.

Just a couple examples I can think of off the top of my head that might.

c903, I'll tell ya, if you can keep buckfever down to a level where you don't have to worry about where that arrow is at, you're a better man than I am! I still get the shakes a little when the bruisers sneak into my area. so far, none have made it out though either.