If the niche you've created is really your passion in life, I think you will not put it in your mind to become a profitable immediately. I think you'll need have a traffic for that to become profitable. By creating a niche for internet marketing you should make it for fun, I mean you are happy doing that without thinking that it will be profitable or not just think that you are happy for that because that's your passion. In order for it to become a profitable it should have a lot of viewers. Your niche blog should a comment box in if for the viewers to comment about it and express their thoughts.