Also, from my own experience - the first WG I ever hooked up with in China was someone I found on
www.escortschina.com (I don't recommend it - I know better now - it's a rip-off). Anyway, this girl wasn't actually a pro, and makes her living in a number of (legit) ways, including most recently as a tour guide and translator. And many of the sights of Shanghai, I've seen with her. Can't give out her number as she's recently gotten married, but it shows that "translator with benefits" does exist.
Similarly, I know a girl in Nantong whose day job is to provide a taxi service. She'll be driving me from Shanghai to Nantong next week. But, at least with me, she's a "driver+".
Chinese girls are often open to doing more if you're nice to them, and buy them gifts - like any girls, really.