I actually support what you're trying to do. However, remember martialartscasting.com and www.martialartstalent.com? Both of those got some early buzz and both are down now. How will your model differ from those previous ones?
BTW, iMartial is actually still going. It was built mostly as a tournament registration site and still functions in that capacity within the sport karate circles. It just never had that much crossover to the CMA here, despite our efforts.