My networking circles are mainly composed by finance bros and lawyers. Is this a problem?

Something that has made me think lately is how most of my acquaintances are service providers. They are lawyers, investment bankers, special sits guys, asset managers. They are white-collar professionals that belong roughly to the same universe of finance, law, economics and business.
Might this be a problem? From my unexperienced point of view, it seems like a rainmaker would need to know a lot of people that do not have this skillset, the kind of people that are the clients you want to bring in to the firm. Engineers who own companies, doctors who own hospitals, farmers who have agriculture businesses. People who are detached from the whole corporate white collar universe. Is it a problem if all my friends are, at the end of the day, not possible clients?