I dislike services that aren't upfront with their prices. Requiring an account to be created AND providing the full job specification before seeing the cost will probably result in a large drop-off of your potential customers.

The value of posting on a brand new job board is about zero, if anything it's net negative when taking into account the time used. So, for a brand new site that lists only 10 jobs, I'd expect this to be free for a while to build up volume and value.