Job Hunt in the GMAT-Prep Sector

I'm a little shocked as to how hard it is to find a job in this segment in America. Kaplan, PrincetonReview, Knewton, MGMAT, VeritasPrep, Grockit.. i've applied to them all with nary a response. I have an extremely strong background in e-learning(founded/co-founded 2 different companies), GMAT/GMATPrep (moderated 2 different MBA forums, still moderating 1, built a reasonably decent Fb app, taught math for a while) , am pursuing a Masters degree in Marketing and am seeking a position in marketing and product development. One would think I would make a good fit and yet, my Inbox is strangely bereft of Invitations-to-Interview(mere-formality-we-WANT-YOU-on-board!!)

Sometimes I wonder if i wouldn't be better off returning to India and opening my own prep center. Could probably wipe-out the local competition.

Update: Grockit just responded to an e-mail I sent them, and in all fairness, Knewton did respond even though that didn't end all that well.