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They have not realized that Bitcoin has many advantages compared to other assets. Bitcoin is growing faster with technological advances, people who delay investing will not only feel regret but they are throwing away the opportunity they have seen that bitcoin is better to have since they knew it compared to delaying and not buying it.
Some of them will express their regret when they find out that their friends or relatives are investing in bitcoin while they do not have any btc in their portfolio. Early awareness to continue accumulating is a better way to face a brighter future by having bitcoin.
In developed countries, maybe the average person has chosen bitcoin over gold, because the investment shift from gold to bitcoin is a smarter choice when the world is developing with increasingly sophisticated technology.
ginsan, I know that bitcoin is one of the assets that performs well as a long-term investment asset, but don't generalize that everyone is the same. The basic difference that we need to consider in this case is the financial ability of each of them, meaning, not everyone has the capital to invest and they don't know what to do when there is no job available.
Take some examples from people in your social circle, what are the reasons they don't invest in bitcoin when others like you invest in it. Even I really have to say that 10 out of 10 of my coworkers who earn below the minimum wage are unable to save for a reserve fund, it proves that they haven't really been able to invest if they don't have additional income.