Wyzant is a joke. As some else mentioned, 40% commission? That's outrageous. I only signed up to try to get my name out in a new city. (I had left a thriving tutoring business that I had built entirely by word of mouth in a previous city.)
They really ought to change their business model if they want to keep tutors happy. I would pay a flat $50/month to get referrals, but that's it. I think you're better off putting up your own website and simply putting out flyers at your local library. Once you get one or two satisfied students, they tell their friends, and they will usually have siblings, too. Word of mouth advertising can spread pretty quickly, but it takes a couple of years to build up.
(Personally, I think Wyzant might boot me soon b/c I have been simply talking w/the parents on the phone and working directly with them. That's how I've always done it. I really don't care if they kick me off. Their leads haven't been all that great anyway.)