I know the salary range in mostly paid by MNCs in Shanghai but never forget they are a lot of graduates are unemployed in PRC.
I would say 70% of all jobs in china are through "guangxi". You have to know someone, or the family knows someone, in order to get a decent job in China. the other 20% is probably because they do need people of that "talent" and can't go through the normal channels. Leaving the last 10% for the millions of applicants to fight over.