I agree that this is commonplace: not 1/4 but more like 1/8 with me. And like you, I make a point of either not using the minibar or TV premium channels, or sure remember it when I do. Have always succeeded in getting it removed, but the process is certainly irksome...
I disagree with the previous poster though: under NO circumstances am I going to let this slide. They already upped hotel charges WAY too far this last year....