That is because based guys cost less, it is much cheaper to keep guys on a base than to have them in HKG. It saves the company money you see. That is why all Paris based officers will come to ... HKG.
To all new recruits, please come to Cathay, we have bases! Trust me, the other bases will have vacancies very soon! I heard a rumor that we are gonna hire direct entry pilots on bases! Miami is gone open this year, swear to god.