If a top kgirl doesn't mind BBFs, she can earn nearly double the money per hour in Japan right now (strong currency, steady tourists), keep in mind those shops run 24/7 so in their prime they can do 13-14 costumers per 15 hour shift.
If a girl want a more relaxed outcall to hotel style working environment, then it's Macao and Vegas. Usually the lucky winner will summon multiple girls in at a time -- physically undemanding and free booze/drugs for all.
If a girl want to just get out of Korea and make some quick cash while staying anonymous, they come to LA -- BBF seekers, zero tippers, pill poppers and two seconders. They are usually greeted by our charming SoCal BBFS President, you can figure out the rest.
But look around the corner -- Animexpo is this weekend and there's always crazy late night cosplay action, pick out some kinky outfits for your ATF and give it to her in your Trump face mask.
P.S. Just looked through AP's list. '09 Christine got me into the game, '09 Lohan made me stay, '13 Sindy made me a pervert, those were good times.