On the other hand, these guys may be smarter than we think. This is some seriously cheap publicity that gets their name out in a big way. Most of their lawsuits seem to die after a short period of media sensationalism.
I can't put my hands on them, but I've seen two quotes along the lines of "there is no such thing as bad publicity" and"I don't care what they say about me as long as they publish it".
It may turn some customers off, but it also introduces Monster to a bigger customer pool everytime they do it. Could you imagine how much they could sell if they lined up their pricing (much lower) to match the performance of their products?
