I do not understand what you mean..? If rich people or large companies make money from investing in cryptocurrencies, does that mean normal people can't? If the price of cryptocurrencies rises, I don't see a problem for each of us to be able to make money on it.
Just the same goal with us, those billionaires are here to take profits, they won't start investing if they didn't see the potential of this industry.
Same with your understanding, if those rich people are capable in cashingout profits, same with normal people they are also capable if they'll also take it seriously the same way rich people take this opportunities.
Everything depends from how you conceptualized and take things according to your better understanding.