because they get 5 mao for every post.

Well I like that method better then if they took the Kool-Aid Man approach and burst through the wall of my apartment screaming "Ohhhh Yeahhhh"

because they think if they can pass as a foreign maybe they can cheat their way outta this country

They try to "guide" the discussion to where it's what they see as being pro-China. But yeah, obvious local is obvious. 

all chinese all so clever speaka english... so good! stupid foreigner never know

I have absolutley no problem with local people that post on this site.
What annoys me is when they pretend to be westerners (almost always American by the way).

They probably pretend to be expats because this is a site for expats. But yeah, they're not very good at it. *cough* extremely obvious *cough*

Come on guys... I didn't think I was being extremely obvious.... I thought I did a good job hiding it....

Now I'm ashamed of my failure and I'll have to go cry myself to sleep

Uh oh! looks like I'm busted  

It's a matter of judgement

It's sadly not just this site. They are all over western news sites pretending to be westerners. It's really damned pathetic.