When I take a look at the available SE domains, I see some very particular and very specialized ones. There are domains which doesn't need to exist because there is already a super domain for it which encapsulates that topic.
For example, the domain for Poker. It has a very low number of questions asked in. The questions related to Poker could be asked in the domain for Games. Same for the domain for Role-playing games. Why don't they make a general domain for "Games"; so that, one would like ask something about Poker may label his question with "poker", and one would like to ask something related to RPG may label his question with "role-playing-game".
I don't know much about Poker, but, how many questions can someone ask about Poker? In my opinion, some topics was really not needed to exist. There are tons of topics out there that should have a SE domain. For example, there could be a domain for movies and other TV shows. Why do they open a domain for Latex instead of covering other most general ones first?
How do SE owners decide to create new domains? What logic do they use? Why do they decide to open a small domain like "Homebrewing"?
EDIT: I saw that there was already a domain for Movies and TV, sorry about that. But this doesn't change my question. Please take my question in a general sense, the domain names I used in my question are only examples.