I would say that $5k is overpaid considering returning scholars start at $3.5k... but more importantly, graduates from Chinghua & 北大, (arguably as competitive as Oxbridge) draw an average of RMB 6,000 upon graduation.

Also these Chinese & their IIT counterparts from India seem sufficiently happy to come and work 18hr days at the employment pass floor of $3000; in banks, IT etc.