Lucky you for never having PMS, but I don't see how that qualifies you to know whether it is rare or not.
I think people who don't have PMS assume "if I don't get it, it doesn't exist". I used to get horrible cramps, and seriously, while PMSing, I cried at the end of the movies "Die Hard" and "Bad Boys". This is not normal behavior for me.
I stated that it was my opinion and I don't recall demanding that anyone subscribe to my POV, so feel free to disagree.