Salary is based on several factors, not just certifications alone. Reporting salary on the basis of a corresponding certification is flawed, and best taken with a grain of salt.
I've had this discussion with a lot of people both inside and outside of Cisco and Global Knowledge. These surveys do not clearly dilneate between folks that have the CCENT AND half a dozen other certs AND 10 years of experience - and the folks that have ONLY the CCENT and zero practical work experience. I do not know anyone who falls in the latter category who makes that much in the States. You can do it if you want to work in a warzone, you can make twice that, but not in CONUS.
And of course GK has some slant towards training, but their failure is not in presenting false data, but more likely in mis-presenting accurate data or in not clearly defining the data set.
I always find salary postings misleading unless they are tied to more details. For example... city of reference, experience, additional certificaitions, educational background, etc. I would expect higher for college grads working in technology in Silicon Valley.