Hotel60 CHing,
You better ask the girl what she is expected. Money or love!
I have twice such experience for sharing, one sucessful & one failure. Both girls claimed the reason to be USB is due to difficulty of finding a proper job in HK. The sucessful one (now became my very good friend) listen to my advice, gave up her USB career a year ago & went to study tour escort (I support the study & examination fees). After obtaining the tour escort license, she is now working in a tourist company earning very low & unstable income (around $4-6k per month on average). You can imagine how bad/tough the conditions comparing to the average income of a not so "hot" usb (around $1XXXXX - 2XXXX). Despite this, she told me she is very happy at present & don't want to go back to the olden days.
The uncessful case (the one I am still sunken), after hearing my advice had tried several attempts to find a proper job. After learning the average salary is 5K to 6K, she abandon the thought & now still working as USB.
My other advice is - don't step in and pull out your leg if you havn't start yet! Good Luck La!