To be brutally honest, your product makes no sense to me and I have reservations about the problem it is solving actually being a problem.

It's defining hook, that people using it must accept any job offer, is outlandish. On further inspection I can use Hustlebee to submit applications to multiple companies. Doesn't that make the promise of more dedicated employee leads empty? Why doesn't it at least check the email address to allow only one submission?

If you decide to go back to the drawing board you need to re-examine your views of the job market. There are many more potential employees than there are employers, that is why people apply for multiple jobs at the same time. It really isn't that big of a deal to a company when they extend and offer and it is turned down. Essentially, you are solving the wrong side of the problem here.