I have thought about this a great deal. I have always exited early, knowing that the influence of gamma is much greater than either the influence of vega or theta. Of course, by exiting early, I am "leaving money on the table." Even so, the reward doesn't justify the risk of a quick move. Plus, by exiting early, I free margin funds for new IC's. Ironically, if I allowed my IC's to expire, I would have lost money on about 8 over the past year and the losses would have eaten my gains. I would appreciate comments on your personal experiences.