I agree with this, if there is a plan and discipline, long-term investment is possible and can be sustainable even with fixed income. If someone's monthly income is $500, he can invest at least $20-$30 after covering all expenses. In the DCA method, no matter what the price, if he continues to invest a certain amount regularly for five years, it will turn into a large number. Which is possible only through fixed income. There are many investors who have started with small amounts and have been successful consistently. The key to investing is discipline and consistency. If you start with a very small portion of fixed income, it will turn into a significant asset over time.
Only an investor with a fixed income can invest in Bitcoin.
An investor must have a discretionary income to invest in Bitcoin.
Without discretionary income, if an investor invests with the income that meets his basic needs or with the emergency fund or the money provided in the emergency fund, that investment will not be sustainable because he will need money for various needs and he will be forced to sell the Bitcoins kept in his portfolio to meet the shortfall in that money.
Therefore, for investment, a discretionary income is needed that will come after a person's basic needs are met.
When a person invests in Bitcoin after meeting his basic needs and emergency fund, his portfolio will be much more sustainable.