GNU/Linux is Free as in Speech, not Free as in Beer. Much like printing presses and political campaigns still cost money, so does hardware and especially so does the time to mentor someone on how to use GNU/Linux.
For many organizations, Windows is actually monetarily cheaper than Linux, particularly organizations that need to deploy non-web GUI applications for users who are never going to be comfortable on a terminal.
For many organizations, Windows is actually monetarily cheaper than Linux, particularly organizations that need to deploy non-web GUI applications for users who are never going to be comfortable on a terminal.