What, exactly, are CC faculty supposed to do that substantially distinguishes them from high school teachers?
I don't mean this in a derogatory manner, I was a high school teacher and found the job incredibly fulfilling.
Similarly, I was a full-time CC instructor on the tenure-track. In order to be approved for tenure I was expected to teach classes (actually semester hours) to a reasonable standard of competency. I was also expected to take part in the organizational structure of the college by serving on committees. It was expected that I keep current in the methods of pedagogy in my field and demonstrate that I was attempting to improve my instruction (note that this is pre-tenure).