For example 7bitcasino, it has no active rep here but I can find this casino in almost all review site including btcgosu.
I think he is not interested in adding those websites. Because after looking at the list of casinos that he has made and will do, many players will go to those casinos to play. When the players face any kind of problem and the support team does not give a proper solution then the user will have nowhere else to go. And if there is a representative of that casino in this forum then pressure can be created against it and an appropriate solution can be found. So I don't think it's a good idea to list any casinos without a representative here.