I did do the math. They have 1008 man-hours total, of which (presumably) a third goes to sleeping, a third to generalities (such as eating, relaxation, and mandated exercise), and a third to working.
As you stated, they have ~240 working hours (probably more, seeing as there isn't much in the way of entertainment up there (except for Internet access). 50 hours out of the ~240 they have for work means that still, only a little more than 20% of their WORK time is going to scientific research, the primary purpose of the station. If I tried to tell my boss that he could only get 20% efficiency out of my work situation, that situation wouldn't continue very long. I'd either receive new equipment, be switched over to another job, or, if it was a personnel problem (which, in the case of the ISS, it obviously isn't,) I'd be let go.
Also, please refrain from name-calling. We're all people, we all have feelings.