It seems 'crazy' because you see the amount of their purchases is quite high... even though everyone's finances are different, so what is big for us, doesn't mean big for other people... I think they still think about not going crazy and staying in control of their finances...
I myself have the principle that for bitcoin purchases we must be able to control it, and don't let our finances be disturbed just because we are too crazy about Bitcoin.
your opinion is very reasonable. yes because after all each person's finances are different. and for them, especially whales, sometimes a nominal like that is a very reasonable thing. there are even some who only use a few percent, or no more than 5% of their total wealth to buy Bitcoin, because that's how much money. and we as people who are indeed at the ordinary level, of course feel a bit wow.
yes, once again, we don't need to see how big each person's nominal is. we just focus on ourselves, how much we can spend to invest in Bitcoin, to achieve the gains we expect with the capital we can afford to lose of course. what is clear is, we just apply our financial management well and wisely.