The space couriers were in the middle of what you might consider a ragtag band of workers, and a super-organized company. God knows who pulled these people together or where they came from, because theirs was a job no one wanted.
The hazards of space travel were enough as a deterrent, but add to that a ridiculously low wage, strict laws and pirates, and you wonder why these poor souls choose to eke out their living as such. Making just enough to feed and wash themselves, to pay for a rental cot, and mostly to upkeep and repair their equipment.
The prospects for them were horrible, the system was shaky and unbelievable, but the fact is: they always got the job done. ALWAYS. In their 35 years of operation, not one courier job has ever failed.