re: Poker & Sticking to one form of Poker!
I think you should have an open-mind about all forms of poker. You dont have to enjoy playing them, like you said, but its good to at least know how they are played. I think if you have some knowledge and understanding of different types of poker, you will have more respect for those who play that type of game. And you might also appreciate NLH even more as well.
I dont see how having more knowledge of poker is going to affect your game negatively. Actually, having more knowledge should actually improve your game, if anything.