The only ones that aim to sell BCC right after the fork are the ones that are buying BTC in the last days.
BTC holders will hold both coins because they know better than the greedy people trying to make a quick buck.
This reminds me of the cookie experiment. Sit a kid down in front of a cookie, tell kid if he can wait five minutes he'll get two cookies. Psychologists like to speculate that well adjusted children will be able to wait. But sometimes adults lie. So savvy kids eat the cookie and bounce.
I don't think I know the moral of this story. Kids like cookies.