Fortunately I think this is changing: tools are coming out that make running quantitative UX studies easier. Services like Optimizely, GazeHawk (disclaimer: that was a shameless plug for my company), UserTesting.com, etc are becoming more commonplace, bringing the barrier to entry for a UX consultant who is actually useful down.

In the future I imagine there being plenty of UX consultants who, rather than having a strong education in the psychology of websites, instead is experienced with the tools necessary to evaluate a design and make recommendations. Then there will be graphic designers, marketers, etc who are actually qualified to work with usability.