Human nature is always different, for example if they already have 0.5 BTC and when the price is expensive then they will definitely sell it because they see a high value, whereas people who want to achieve the goal of 1 BTC must be consistent throughout their long journey, I know some people are salaried the price is not that big so they will only set aside lower than what is expected.
Still, the golden opportunity is now not waiting, buy dip now if you have lots of money.
There is no doubt that human nature varies from person to person, however the decision to sell Bitcoin holdings is not solely driven by market conditions or desire to book gains, there are many other factors those can influence our decision making, such as long term goals, financial situation and risk tolerance level. The history has demonstrated it consistently that long term HODLERS of Bitcoin are always at advantage, therefore, in stead of booking small gains, wait for the bull cycle to relaize significant profit.