Why investment is only for the rich, even a rich person and a poor person can still invest.
If I say invest for themselves, anyone can do it. Taking courses or buying a book are also ways to open your mind.
There are a lot of wealthy people coming from scratch so we can invest now.
Investment requires money and most poor people do not have the money. A poor can get knowledge about the investment but he can't practically invest unless he had the funds.
In case of bitcoin, the poor may also invest less amount but again he will get less returns as compare to the rich person. The logic is simple, the more you invest in bitcoin for long term, the more returns you will get.