People are investing in bitcoins to earn more money. If they are investing with their own hard earned money, they have right to hold and sold their bitcoins as and when needed. Every investor has his own calculations about return on investments. Bitcoin prices are raising daily,it has crossed $9000 mark. Experts are predicting new attractive targets, so why one will sell his investment of bitcoin. Instead they will accumulate more and more bitcoins for future profit. There of no question of greed.