Also, your focus is wrong. I know you won't change it, because you've spent 6 months working on this idea and I'm just some random dude, but as-is, you will have a very hard time gaining users for your project. This is what you can change to actually be successful:
"Companies post a process or business problem they are having. Students post solutions. One students answer is rated as the best and the companies pay."
That is a tried and tested model that works. You will have the students because everyone is looking for cash. I mean, think about it for a moment! What is all that text! What is all that signup form? Make a single field with an email address where the student can give in his email address, and he recieves the projects from the companies strraight up. When he wants to answer and earn $200 or so, he needs to give in his details then!
And charging companies?! You know you are aiming at the enterprise market if you follow that model, and I sure as hell hope you know how to do enterprise sales.
Let me give you an example of something that would work:
Student John Field comes to site. He sees the text - "Help companies optimize and fix their business processes with your ideas - and get paid for it. Enter your email address". He thinks, sure, why not, enters his email and forgets about it.
Joes Bicycle Shop stumbles across this website. He thinks - ah, I need to get cheaper bicycles from Asia down to my shop. Maybe these guys know how that works. He posts this. John Fields recieves the posting. He sees that he can make $90. He researches on the net, posts a reply. Bicycle shop saves several thousand bucks, John gets his $90, you get your cut.