With over a decade in the WordPress community, I can attest that everyone who is earning money with WordPress should be active in the WordPress community.
From the networking effects of knowing people to help you on your topic to having shortcuts when questions arise, the WordPress community network can give you an information advantage that others don’t see or have. How are others solving the same client requests that you are having? What feature in the next version of WordPress or a known plugin will make your life easier, and how can you influence the feature to fit more to your requirements?
WordPress is an open community that uplifts everyone who is part of it. And the best point: You don’t need to know development to be a part of it.