I will agree with you that many times people have unrealized potentials in terms of both increasing their income and decreasing their expenses, yet there are also likely cases in which people are struggling within their own best efforts, and so they have difficulties (and perhaps even impossibilities) increasing their discretionary income.
Nothing is impossible when someone has a plan in their life and to achieve a much better financial source requires hard work by relying on existing opportunities and when we want to change our lives for the better, then every effort must be made to grow a much more stable income. The existing potential needs to be increased and at least be able to meet the needs of life and continue to try to set aside a little money to start investing. It may sound difficult for some people who do not have a steady source of income, but it does not mean it is impossible if they are willing to fight.
I think that people can do anything if they try. It is very important for a person to have a stable income. A stable income is not only necessary for investing. Having a stable source of income is very important for investing. Because if you do not have a stable source of income, you will not be able to manage your investments properly. And you will not be able to buy continuously. You may face many kinds of difficulties. If you are in the middle of a financial crisis, then you will be forced to sell your holdings. If you do not have a stable source of income, then your investment will not be correct. It is very important to find a stable source of income before starting investing.
Bitcoin is not a get quick rich scheme where you can invest $1k and get $10k after one week. Considering the current price of Bitcoin, it is almost impossible for that to happen but if the investor could exercise patients together with a good risk management and make his investment a long term investment he is likely to experience a 10k and that can be achieved with ease when he has a steady income so he doesn't necessarily need to fix his interest in withdrawing any bitcoin before his estimated amount of years for holding even during price changes. Having a steady income is crucial in sustaining a healthy investment journey, and by steady income I mean a good range of income cause even a begger on the streets do get a daily income. However getting a job first that can generate funds for your personal needs with spare cash after all expenses have been made is the right definition of the steady income job. In as much as bitcoin has made alot of people rich, we also need to consider the risk involved before making any decision. Volatility seems like a double edge sword which can make you profitable or sets you in loss, however with no guarantee of making profits we also need to be conscious of how aggressive our accumulation becomes and that is why DCA stands out to be one of the best strategy. Being able to invest little fraction from your discretionary income without necessarily feeling uncomfortable must be the biggest flex in bitcoin investment.