How many give plus's to their responders

That deosn't give them a higer ranking..ie it has no effect on their points. I give those who gave a good answer a + because I can only give on ebest response and sometmes there is more than one...I also give - to those who are rude or don't answeer the question at all (like say wtf) and the middle of the road ones I don't mark anything, answer wasn't good, wasn't bad..