It depends whether your product is used by individuals or business. For a business, there typically is a cost for competent staff/contractor to install, config

It depends whether your product is used by individuals or business. For a business, there typically is a cost for competent staff/contractor to install, configure and administer any system. So you could offer paid support to alleviate that need. AFAIK, that is what RedHat did with their early Linux distro. From what I'm seeing, technically competent individuals want everything free and are able to solve their own problems. That market might not even be worth pursuing if the unpaid support becomes a burden for your business.