If you are a trader don't wait for the highest value to develop if it reach a good value sell it quickly and investigate then only the profit is giving by the trading is exactly possible that you are expected.
No it is not good to be fast making decision to sell as we know when the price started to increase then most of time it takes time but price rises to the peak, so if you will make quick decision to sell it may make you regret in future for selling so early, thats why wait and let your money be more, more and when you realize your investment has become more than double you can trade.