The recent discussion about hourly rates for contracting interaction design struck me an extremely limited take on 'how much we make'. In fact, it really made me want to scream rather than comment. But here oes...
First - the definition of what an interaction designer is and does far from simple. Varying backgrounds, educations and the tasks at hand contribute to what we as single source of labor are worth. Anything from strategy, architecture, research, task analysis, process flows, wireframes, graphic design, coding and documentation can fall into this job title.