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From a psychological perspective, being in profit and being comfortable with your average purchasing price does help a person from feeling less-comfortable with his/her investment. Hypothetically, compare that with a person who recently purchased Bitcoin at $50,000 with his life-savings, then I'm confident that that person would absolutely feel ten times less-comfortable than the person who bought Bitcoin at $5,000 with his/her life-savings. Plus there's also the experience and how deep is the person's understanding which I believe also helps in HODLing Bitcoin.
But you're also right, some of it would also depend on a person's own psychology. Indeed purchasing Bitcoin using all of his/her savings does require a person to lose some of his/her mental sanity.
Even though I attempted to give a variety of examples, I did not consider my examples to really emphasize the extent to which a person might have had exhausted his savings, even though surely those would more likely end up being examples in which a person would be more inclined to panic.
My main two examples attempted to emphasize two possible comparative responsible approaches, yet one person had been in bitcoin for a while, so they are likely much less inclined to panic based on their having a long practice of buying, yet even my example of the guy who had ONLY been in bitcoin for a year, if he has a preset plan to accumulate a few hundred per week, then he likely would not be bothered by BTC price changes (and may even welcome a drop in prices) even though his BTC accumulation payment amounts are not really changing, and if the dip is relatively fast, he might not even end up catching the max of the dip, depending on the day of the week that his DCA is applied.
So maybe in some sense we are agreeing that the ones who seem to be flying by the seat of their pants are more likely to panic, yet even if the guy who got in had started to come into bitcoin without plans and with practices of flying by the seat of his pants, after several years and perhaps more than a whole cycle of bitcoin accumulating, he might have had figured out some systems to help him to deal with large price changes, whether it is buying on the dip or continually buying... but yeah, the longer a guy is in, he might not feel as much of a need to continue to buy, so then when he might have a decent amount of cash building up from his not having had bought, he might really appreciate dips that are 20% or more and he might have one or two thresholds that trigger him to buy a bit more.
I hate to attempt to pigeonhole these different kinds of guys too much since there surely can be quite a bit of variance when there might not be plans, and surely I tend to already have various plans, and I also have various buy orders that are already set at certain increments, and so even for me, sometimes I can still get a bit nervous if the BTC price is dropping so fast that so many of my buy orders are getting executed, so then I can sometimes even question myself in regards to whether I had bought too many at higher prices and I could have had set them lower and various kinds of questions including considering at what point I might start to get worried that I am running out of buy orders that are preset and if I might need to make any adjustments to what I had already preset.