No body will invest all his salary in Bitcoin it is not done anywhere except the person is insane
Maybe you haven’t seen someone like that before, but it’s really happening. I have come across different people who are ready to invest all the money they have with them in bitcoin. Just because of what they hear about bitcoin from other people, they already think that if they invest in bitcoin, they will quickly be able to increase their money, and they don’t even know they can lose when they invest in bitcoin. Most of the people who do crazy things like this lack basic knowledge about bitcoin, most of them are new to crypto, and they just follow what they see on social media.
Then if surely there is such a person, I guess the person is insane/unreasonable or doesn't know the principles that guide investment strategy. And I will tell you that such a person will not do better in bitcoin investment. He will simply buy aggressively so quickly and sell his bitcoin holding. If you have such person as a friend I think you should inform him about the impending danger of buying agresively when they don't plan to follow the normal procedure which is buying bitcoin through DCA ,dip and lumps alongside having emergency fund and strike a balance by having discretion to be able to buy regularly. If surely anyone does not follow this procedure then surely such person is bound to buy agresively and sell agresively.