I currently own one forum. I think owning more than one forum could become difficult to manage because you will have more than one community to manage.
I currently own one community which is Forum Sensation. I've ran more than one community at the same time before and it's evidently very difficult and virtually impossible for me to succeed.
I own Forum Authority and that's enough.
i have very few communities but all are dead . i sold my last website to my friend due to lack of time
At the moment, only 1 online community, its going well.
Currently I own one but I am not working on it but in the past I have owned few.