Sure if you have long term investment ideas, then you would likely not be selling any of your bitcoin now, but I doubt that the reason would merely be because you expect profits to be guaranteed in the future, but instead that you had made your investment into bitcoin based on a long term investment thesis and you are not merely thinking about short term profits.
A long term investment idea is depend on what you have in mind and your target, some do not calculate the future well and they began to sell their bitcoin, what triggers some people who is inquisitive to sell their bitcoin right as bitcoin is increasing is because they believe on the physical increment of bitcoin and they don't make use of chart to know what the future will yield, secondly, their is different between someone who is into long-term Investing and short-term investing, someone who into short-term investing doesn't think of the future it only be interested of making an instant profit whereas long-term Investing somebody is concentrating into the future and that is why a long-term investor keeping holding it bitcoin knowing that bitcoin might keep adding in value and as bitcoin is adding its making a profit
It is based on your mindset that made you to start your bitcoin journey and the love you have for bitcoin as an investment that is worth hodli for a long term. Some people are into bitcoin investment to sell and take profit, while some long term hodlers believes in bitcoin as an investment that is worth having till old age, just the way people that have gold as an investment prefer to keep it till old age as long as they don't depend on it to survive.
I guess that is why people like JJG who are among the early investors in bitcoin has the same feelings because holding bitcoin as his investment gives him joy.
I am not sure if it gives joy in and of itself, but it seems to give options - ways to store value and to potentially be able to spend value in a way that no one can stop me (or any other BTC HODLer) from being able to send it to anyone else, and surely there still needs to be ways in which we are able to communicate, whether it is face to face, and you show me a barcode and I can just send it or receive it... but also there can be places around the world or even sending to yourself from point A to point B.
Of course, there are times in which BTC's price is fluctuating a lot, including several periods in which it dropped in price by more than 50%, and even in the ballpark of 70% to 80%, but we can still zoom out and see that the increase in value (price) has been continuously in the upwards direction, even if we have several extended periods in which it had been dropping in price or not really going up in price.
There is no real reason to believe that bitcoin is not going to continue to increase in both value and price, even though it is not guaranteed to do so... there is plenty of evidence that shows that several aspects of bitcoin's fundamentals have strong foundations... --even if we are looking at the various network effects of bitcoin's ongoing adoption (as outlined by Trace Mayer) .. which surely are building from sound money principles and solid technical aspects and in-place free-market incentives to reinforce the sound money fundamentals.
But most bitcoin investors are only after profit taking and not loving it as an investment. I ran into some financial challenge recently and I need to take care of it, I almost sold some fraction of my bitcoin because my emergency funds is not able to handle it, I sat down and thought over it and I never liked the idea of selling because I feel that I have not reached 50% of my bitcoin target.
What I did after much thought was to go to my Boss and get a salary advance which I used to solve that emergency and I got a big relief and happiness that I didn't sell a dime from my bitcoin, even though I was on profit.
These can be tough decisions to try to figure out various alternative means to deal with tougher times, and sometimes it can take a bit of time to dig ourselves out of a hole or even to get ourselves back to a position in which we have our emergency fund in place and it is sufficient and we can continue to build our BTC holdings at the same time as we might be buttressing other aspects of our lives... whether it is relationships, work matters, housing, food and health.