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And, of course, if he is investing somewhere close to 100% of his discretionary income, he might be sacrificing driving a nicer car or maybe living in a less luxurious house or maybe going out to eat less (or perhaps not at all), so there could be some current sacrifices and reductions in quality of life based on investing into bitcoin, even though the investment into bitcoin would not be taking away from the basic expenses, yet the investor still chooses what he considers to be basic expenses or not.
Of course, that could happen if they push for a bigger budget than they can afford, meaning if they choose to sell the car, choose to sell land or whatever, but that's not a good thing to do. Because if they are beginners doing this then I think they will quickly become mentally depressed if one day the price drops 50% and they are not ready to accept the situation of market changes. So it would be good for them to save on their regular monthly expenses, for example they spend $2000 per month so a good step would be to save their spending budget to $1500 and $500 of that save they can allocate to investing in bitcoin.
Forcing 100% of their income just to invest in bitcoin is certainly not a good step because it can have fatal consequences if they are not ready to face the change in life from being rich to living a simpler life. Maybe it would be better to only allocate 10% and the remaining 90% for their living needs.
It is better to take the investment journey in a relaxed manner without forcing all their money to be in bitcoin. However, if they have become millionaires from investing in Bitcoin since the beginning or starting in 2011, of course they will be able to read their cash flow by continuing to move aggressively with every purchase they make. The reason is very logical because they have bought bitcoin at $200 or cheaper so they will not feel shaken when the price drops 50% because their cheap buying investment will certainly not have a bad impact on their portfolio. But of course all of this is no longer foreign and some people have learned from many mistakes so they will do the best from their initial planning in investing for the long term.