Salary of SEO specialist

http://www.entireweb.com/newsletter/archive/2006/ISSUE257.html :
"...In most cases the individual will be wearing many hats spreading them thin. His or her base salary according to Salary.com on average would be $85,703. That is $7141.92 a month and roughly $42 an hour. This is for one individual with hopes that they bear positive results. Let's say they do not. It will take 3 to 6 months to start to truly see if the individual is an asset or not. That is $21,425.76 if you decide to let the individual go in just the third month. Not to include cost of taxes and benefits. And if successful, your company just paid $85,703 per year for SEO..."