Of course they won't this is what they have been waiting for. But as the price is keeps on increasing the higher price of bitcoin they wanted to be. Because even they already earned from the price increase, they are still going to ask for more price increase if they sees the price which is already good enough to be contented.
Isn't asking for more called greediness? Anyway, it is true that once the target price is met, we keep on hoping to have a higher price and keep our bitcoin which is supposed to be sold at that price. We tend to wait a bit longer hoping for more increase in price so we can book a better profit which often times ended in a much lower price because the hype has gone we failed to sell when it is at its peak of increase. As a result we wait again for another increase which will take another month.