I'd argue that the leagues and owners much prefer the boo-ers and cheer-ers. Any reaction - good or bad - is better than no reaction in creating interest. Back to the topic at hand, I will mostly agree with your statement about boo-ing, but there are exceptions. Someone like Gary Sheffield, who deliberately plays poorly in an attempt to get traded, certainly deserves to get booed. I can certainly understand booing Braun for lying about taking PEDs. In general, I think it's ok to boo effort (and a lack of it), but not necessarily results. I'm more so quiet because I enjoy just watching the game. I like to think about what I'm watching. Baseball is relaxing for me for the most part.