Like many people I find salary surveys to be very interesting. It's interesting to see how you compare to others in your area or in other parts of the country. And I've found Robert Half's (RHT) survey to be useful.
However, I've also come to view it somewhat with suspicion. Early in my current job search I was contacted by a recruiter for a position in New York City. One of the questions that the recruiter asked me was what I wanted to earn there; what my salary range was. Now, in fairness to RHT and their survey, the recruiter gave me nothing to go on. He wouldn't tell me what the company was he was recruiting for, nor would he tell me what the industry was, nor would be even tell me what the position was. So I used by position title, skills, education and training, and to the best of my ability using RHT's 2014 salary survey and giving it a lot of thought, I finally gave the recruiter my salary range. You could almost tell through his response that he choked when he saw my estimated salary survey. I apparently was wildly over estimating what someone like me could make in NYC. But I was giving it my best shot, taking into account the difference in cost of living between where I currently live (the Albuquerque, NM area) and that of NYC, with my title, skills, education and so on. That recruitment went no where.
So although I find the RHT salary survey's to be enlightening and useful, I also take it with the proverbial grain of salt.