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Couch Surfing.
Roarie. D3/50mm, 1/200th, f/1.8, ISO2500.At first I didn't think that the subject of niche and focus would be relevant to Magic. Then when I thought about it, I realized that having a specific style and genre of photography really focuses your ability to pull certain models; models for (your type of) Magic. When I thought about it further I realized that this was all part of Model Interaction. That models look at photographers' work and then decide whether or not to work with you based upon your genre, your niche, your focus, and of course your abilities in that particular niche.
Take me for example, you'll find a lot of fashion nudes in my recent work. I shoot fashion nudes because I like shooting fashion nudes. It's that simple. So my very first recommendation to any photographer is to first find your passion and then shoot your passion. Don't get sidetracked with all the wonderful sub-genres of photography; glamour, beauty, lifestyle, fashion, etc. If you like something more than anything else, shoot that.
It will do wonders for your portfolio and your ability to pull the right models.