Where do you get this information? Half of 2009 and 2010 USC full time MBA students originally from mainland China found jobs in US with H1B sponsorship. Please don't mislead others without solid evidence.
At the end, it depends on where you want to live and which kind of life style you want. A US job can not give everything you want. Many USC alumni choose back to mainland China or Asia not because they can not find a job there. Similar to Chinese students from other Top US schools, they go back with all various reasons: family, better job opportunity, etc.