A traditional online Jobs Board, such as SEEK, costs per posting whilst Sourcr is completely free to post. In jobs board you're only targeting the active market, those currently looking for a job who happen to be looking at that page at that particular moment.
Sourcr allows you to connect with professional recruiters who can target the passive candidate market. They have a wide range of pre-vetted candidates who they can expertly suggest based on the job description and company culture.