Be careful, never sell bitcoins because someone is greedy for money because the price of bitcoins has increased. Learn to buy bitcoins, not sell them.
I don't think someone would want to sell their bitcoin at this time just because they are greedy for money when they are fully aware that the Bitcoin that they are holding can give them profits in the future.
Anyone that you see who sells their bitcoin now is doing it for financial reasons and not for greed. I can't have an urgent need of money and you expect me not to sell my bitcoin so that I won't appear greedy, whereby I know that I can buy bitcoin back at any time I have the money to.