Depends on your needs. If you don't need to sell it then i think it is a long time investment.
Perhaps! It is not a greedy act. It really depends on you, if you sell it it is of use to you. if it's not of use, you can keep it for as long as you like, it gives you profit, but it doesn't mean you're greedy to hold it.
I think holding your bitcoin doesn't make you or anyone that's doing the same thing greedy. You're the one that worked hard to get that money and not someone. However, i think holding your bitcoin is a good thing because what if something came up important in the future and you'll need a big amount to spend, at least you're ready and no need to have a hard time finding anything to make money.