Several decades ago, any light-skinned person from a native country could get a teaching job that would pay for his apartment, food, basic entertainment, and allow some savings. While all companies merely requested either candidates with a bachelor's degree, high school graduates, university students, and even those with forged credentials.
However, nowadays China has technologically and economically developed a more competitive environment that will not tolerant casual teacher employment, and tends to punishes such behaviors. For example, degrees of candidates can be verified using online services like degreeverify.com or National Student Clearinghouse; teaching salaries comparable to Western countries ensure that capable, motivated, experienced, and professional teachers are competing for jobs. Slowly, Chinese are understanding that championing Western systems of integrity (and practicing such codes), has rewards in ways that taking short-cuts and unethical practices do not.
Teaching in Shenzhen is good for esl teachers