I don't know if it will help saying this as it might still be an issue of pride, but perhaps a better attitude to approach the reputation system is to treat it more like a game than anything else. It's just for fun, right? I mean no one has to post here at all; it's all voluntary, and even if you get a low score (or rep), almost everyone here lives hundreds, if not thousands, of miles away, so it's not like you're dealing with "real" people in your life. The game is this; get the highest score possible by posting the most amount of good material possible. Since the average age here seems to be above 30, most of you are going to be experienced/wise enough to know the difference between good material and bad material, so there should theoretically be more ups than downs anyway. IMHO, I say don't take the game too seriously and just have fun with it. Be charitable, give ups for good stuff, downs for bad stuff, and things will work out.
On the note for treating it like a game (for adults :wink:), I say Matthew should give a prize to the first person to reach 300, or 500, rep points (not including him, though).