Well buy at 90 is not wrong. Buy at 80 good, at 70 very good. Than hold and relax to next hype. As soon TrueCrypt starts in that hype his buy support spam again,.....you know what to do 
Sometimes holding is better, i have already missed a 2.5x increase due to selling once which was truly horrible. It is possible that i did a huge mistake of not holding now and the same thing will happen again. I think my money is better spent to short ETH or something now.