It makes sense for HKnese to order from foreign (USA) as HK postman service is super good and reliable, don't need to pay service charge. (Vs in Canada here, risk of loosing parcel is huge, plus average $200-300HKD extra service fee)
You don't need to pay duty and tax in HK too.....
HOWEVER, it is still much much more fun to bring out cash, go to a shop, buy what you want, and bring it home!!! Much more encounter!!