An article released on Hong Kong's Apple Daily Website lists the current fees for Korean celebrities appearing in Hong Kong.
G-Dragon, Taeyang and TOP are currently valued at 190.000 USD each. Top of the list is Kim Soo Hyun with approx. 700.000 USD.
Article: http://hk.apple.nextmedia.com/enews/realtime/20150204/53405499?top=4h - translation via @mystarmyangel