Every week they update their advert for pilots on the AFAP site and extend the closing date for applications. Always with award rates and an 'immediate start'. Their latest ad offers relocation and accommodation, so on the surface it seems attractive enough. One would imagine that they have a long list of applicants already.
Maybe they are setting the stage to sponsor someone under a 457 visa?
If none of the applicants have a B1900 rating, surely it would be cheaper and quicker to simply type rate someone living nearby. Anyone who has flown a King Air would have to be a suitable candidate.
Or, as has been suggested elsewhere, the conditions and security on offer simply don't cut it.