I can’t find this quote online to read the context. Can you provide a link to it?
Here is the only Rogers’s quote on Marx that I could find:
The statement in the quote you give is just a commonplace: people with wealth influence politics, culture, etc. Such a view is not, then, distinctly Marxist. If Marx repeated commonplace truths, then he got those things right.
Here is one thing Marx wrote about money:
If Marx repeated commonplace truths, then he got those things right. But the things that are distinctly Marxist are wrong.
Here is Rothbard on Marx: