Yeah you are right that this is not to looks greedy. That, some people are holding Bitcoin because the value of Bitcoin is increasing. As my thinking, this is the basic right of everyone. They have their own choice when they want to sell and when they want to buy. To hold Bitcoin by its price going up is the intelligent thinking, not to be greedy. The trading on Bitcoin is too much easy and fast. Investors are should be patient enough that they see the right time when to sell Bitcoin.