I struggle to understand this "only sell at a profit" mentality. If it's the right call to make to sell and buy back lower, then it's the right call no matter where your profits are. In the last dip I sold out 80% of my holdings at $11,500 despite being down on my investments by about 10%. I bought back at $8000 and $6000 and the following day I was back in great profits. I know it was risky but I was confident about the drop. I'm selling off a good bit again now but this time I'm quite profitable thanks to that risky move I made.