Someone who bought 1,000 BTC for 1 USD each and is still holding qualifies as a greedy person. That person could cash now 14,000,000 $ (14 Million!), but if he is holding just because he expects the price to go higher still, that's greed, plain and simple.

Being greedy can be very risky, because one can see reduced his gains if BTC crashes to the half, like the current trend seems to show.