There are a few points I'd like to make here.
First, there is of course a lot of greed when it comes to investment, including Bitcoin investment. People want more profit and can't seem to get enough even when things are going well, as they've been for Bitcoin at least since March.
However, my second point is that it's true that the price a year ago was half of what it is now, but it doesn't show the full picture. The price was also a bit higher in November 2021, which was a little more than 2.5 years ago, and it was almost the same in April 2021, which was more than 3 years ago. So there is reasonable concern regarding long-term investment if the price was the same 3 years ago and Bitcoin doesn't seem to be able to grow significantly beyond that.
Even greed can be used in a way that would profit you. Greed can make you forgo the plan to get more profits on a trade while in the market and the trade is heading towards your direction. Greed can make you adjust the plan to suit existing circumstances (drafting a new plan) but, can we really call that being greedy? I cant say but, too much of everything is bad and so long as youve made profit or are making profit with a procedure enacted, its good you stay the course as you dont only profit from it but, reaffirm yourself in your strategy.
Also, its very impossible to have a some worth stable price for Bitcoin or the fact that, price cant half after a bullrun. Maybe a lot of users tends to forget we still have the bears in the market and they always gets to pull price down and mark the dip for a session.