During my apprentice period I work for a plumbing and electrical company. From having done both I will go on the record and say that if I had to do plumbing I would charge more too. I would rather hang ten RLM fixtures than set two kitchen sinks. I would rather set up five services than dig a trunkline, run dwv and sweat copper. In my state there are 8000 sparkys and only 4000 hockeyoligist and I can see why. IMHO, if they can charge more and get it...Good!