First off I am not intending this conversation towards pros who need to keep current with the latest gear to be competitive. This is more directed at hobbyists such as myself.
So I was looking through some "gear lists" of other hobbyists here and it got me thinking. Some people here have only been into photography a few years, like since the T2i came out and have since owned 4 or even 5 different bodies and a plethora of lenses they have also owned and since sold. I have read about one guy on DPreview who has owned 4 different copies of the Tamron 28-75 because he doesn't know if he likes it or not!
On the other hand, I have been shooting SLRs since the early 90s and have owned 3 different bodies. My Minolta x700 died, my 350D/XT is alive but has become the wifies, and my current 7D. I sold the Minolta lenses after the x700 died and I have sold 2 lenses in Canon mount: one was the kit 28-135 that I intended on selling to recoup the cost of buying the 7D.
So what is everyone's take on this? What makes one want to buy and sell so much gear? Is it because they don't know what they want? Is it just simply the GAS syndrome, although the selling part to me doesn't seem like GAS. I usually do extensive homework before making a purchase and when I finally pull the trigger, I am very satisfied with the choice.
If I described you, please chime in. I am very curious.