Endless parade of newbies
I don't know why it took me so long to notice it, or maybe I always did, and it only recently moved from the subconscious mind to the conscious. I read the forums here fairly regularly, mostly the AS3 forum. I notice that a huge majority of the threads posted there come from people with fewer than 10 posts. If you take 20 posts as your number, then it's almost everyone! Where are all the people that hang around for awhile?
Go to the AS3 forum right now (or any given time). Start reading the threads. You will usually be hard pressed to find a thread posted from someone with more than 10 posts. And they almost always say up front that they are new to Flash and Actionscript 3 (and to please excuse them for it).
It seems as though people must join the forum just to get some help on a project or a school assignment. Apparently they move on after that. I always assume someone has a long term interest in Flash (I guess just because I do), but lately I get the sneaking suspicion that's probably not the case with the majority of them.