Interesting niche concept, but why did you choose to charge the individuals seeking jobs, rather than charging the business advertising the job?
The business model of most recruiting sites are that the customers are the guys with the jobs, seeking qualified candidates.
The business model of this site appears to be "selling the dream of adventure" to individuals. It's not really about selling job advertisements, or even jobs. It's about selling the dream, "even you can be an astronaut". To be able to sell the dream, you have to establish credibility that you can deliver. That's missing from the site as it is now.
Your thoughts?