The volatility of BTC is useful in such situations. If you sold now, the price may rise to $40, then crash to $15, and then rise again to new heights. So if you

The volatility of BTC is useful in such situations. If you sold now, the price may rise to $40, then crash to $15, and then rise again to new heights. So if you do sell (and are keen to stay in the long-game), you have to be confident that you will be able to buy in again at below that price (NB transaction costs). If you achieve that (which is done most effectively by guessing when the peak of the bubble occurs) then you wouldn't lose out it the long term. Then you have to weigh up the risk vs reward..