It shouldn't hurt if you play it smart. If you liquidate 10% of your cold wallet(s) during a strong rally, you can almost be sure to buy back at levels significantly lower than where you sold at. It allows you to benefit from this market's fluctuations, but without exposing yourself to the risks associated with short term trading. Not acting at all is fine, but for me personally it's a wasted opportunity that this market from time to time offers. There will be a time where the fluctuations aren't as severe as they have been for years, and thus the opportunities will become rarer and less rewarding overall. It's up to you in the end....