You make a valid point, but those people are the minority. At least 50% of the people around here are here on a daily basis asking "Who wins this trade?" for the 8,000th time. These "trade-a-holics" are insufferable and clog up the whole system for people with legitimate questions and issues.
I agree with a lot of people who keep asking what are your so-called "IMPORTANT" questions/posts for these message boards? "please put this guy on the IR"? "What is the meaning of life"? seriously, the posts you call 'stupid', the trade/which player is better questions are exactly what these boards are for. A lot of people just want different opinions/more feedback. Re-assurance, even.