The 100 landmark has been the most psychological resistance and support. Did you remember, it took a lot of time before it broke this line during the rising, and the media didn't stop talking about. So it's simply for the same reason, I guess.
Ive changed my mind, i actually love all the idiots who are buying at the low $100 level, cos they are the fools who keep providing me the bounce to continue the sell-wait-dump process!! HAHA