Im curious about one thing... Does game developer play game they made, or since they know how its made, they don't use it? The same question apply to mod developer, but im not talking about small mod or little tweak mod, but about big mod.

Some play their mods a lot to make sure the are free of bugs but most of the big modders I know enjoy creating content more then playing it so they probably spend 100 hours modding to 10 hours playing.