Not all investors who are accumulating bitcoin are rich; some of them are poor, but they are investing in bitcoin according to their discretionary income, which allows them to sort out their daily expenses and also hold their bitcoin investment for a long time. And with the help of the DCA strategy, they can easily accumulate bitcoin consistently, either on a weekly or monthly basis, when their money is readily available. It is only when you invest in bitcoin above your discretionary income that you are likely to get it wrong with your bitcoin investment because there will be a time when you will find it hard to sort out your daily expenses, and it might cause you to get off the game partially or permanently.
Rich and poor and people of all professions can invest in Bitcoin. One of the differences between rich people and poor people in investing in bitcoins is that rich people can invest more amount of bitcoins and poor people can invest less amount of bitcoins as they have less/small source of income. While there are other strategies for investing in Bitcoin, DCA is the most effective investment strategy for poor people. This method is very simple and accessible, as one can start investing by buying a very small amount of Bitcoins using this strategy.
Bitcoin investment is for all, both the rich and the poor but i find it problematic for a poor man to invest in bitcoin because what he should be aiming at should be how to get out of that vulnerable state of poverty by looking for a job or starting up a small scale business then from the proceeds, he can be investing in bitcoin using the DCA strategy. If a poor man invests with the little he has without sourcing for a reliable income, he can stay one day and angrily sell off the bitcoins in his custody because he will feel that he can't be suffering while he has some money in bitcoin.
It can even be increased incrementally i.e. if the income of the individual is higher he can increase his investment amount over time. Whether a person is rich or poor they have a goal to save money for the future. They can feel free to invest bitcoins with the money they are saving for the future. So people of any profession can invest in Bitcoin now.
Increasing one's investment simply depends on the productivity of the source of income where the money to make accumulations is being generated from because for someone whose salary or income is still within that same amount he started his investment with, it will be difficult to increase your investment amount. It is needless to save money to invest in bitcoin because those times you are saving up those money might have been a good buying time when the price is cheaper than when you have saved up money and want to start when the price has already skyrocketed. That amount that you want to be saving little by little can be used to start buying bitcoins little by little instead of leaving it in Fiats with the idea of buying later on.