I have to disagree with your second paragraph. There is a lot of hindsight used there. When the SP hit 7.50 I did a good analysis of my position. I agree the SP at 7.50 was unsustainable short term.
I had a large gain already to deal with from spider, which meant a good sized donation to the tax man. To sell NOT at that point meant I would have to set aside 34% of it for taxes or 2.50 per share. This meant I would only retain 5.00 of it to buy back in later. Using hindsight I would have been alright as the SP went a lot lower than 5.00, but who could predict it then. I agree that the gain would have been there as my average cost would have risen for later sales, but my analysis at the time said I would be holding fewer shares at the end of the day. I don't think anyone thought at the time that the SP was going to take another dive.
Regards
K