Absolutely. But the dog didn't ask Pavlov if he would kindly stop ringing the bell every time he fed him, nor did the pigeon ask Skinner to stop shocking it when it did certain actions. The mere presence of a rating system is poisonous - it is misused, promotes the wrong kind of content, and it is never used to promote good content.
I agree that there's always the issue of what the ratings system itself generally represents. Some people rate positively because they like something; others rate positively because they think it is exceptional; others still do so to show good spirits (I've honestly rated with the intention of all three). And, in essence, the same thing applies to "neutral" and "negative" ratings. The system's too ambiguous to really be taken seriously by the ratings-recipient; for the most part, it's not really "misused" per se, but it is most certainly impossible to actually interpret (I'd say the only real misuse of it would be in using it in personal attacks, since that's something that's not only clearly out of the scope of the ratings system, but also something that's just plain not done here, in Iwaku).
That said, I believe that without the system, people would begin expressing these little opinions in other, less constructive ways, like posting tons of fairly meaningless posts in serious discussion threads, or privately pestering an especially opinionated author for being *wrong*. So, however arbitrary it may be in terms of expression, in terms of making Iwaku more inclusive and, er, internet-friendly, I have to say that the ratings system is very important.
Additionally, I argue that writing is, in fact, 99% for others and 1% for yourself. You write for an audience. Writing for yourself and posting it expecting others to read it is selfish. The definition of the GM's job is to please others.
I half-and-half disagree with this. Writing is a multi-purposed affair, so it can't really be wholly defined as for an audience. Some people, for instance, write solely for themselves, and only publish not for the pandering to an audience, but for some sort of psychological release; a sort of mass-therapy, if you will, following the idea of letting it all out. Others still write for writing's sake, publishing to somehow make bigger their talents, or to make whatever living they can with what they've made, without necessarily pandering to the needs of an audience (sort of like doing something that you do for it's own sake, but that you hope, and only hope, will give you a piece of pie on the side).
As for the GM's job, I completely disagree with your statement on it. The GM's supposed to handle the game to whatever specifications the game has already been set; whether those specifications are up to the players, the GM himself, or some handbook, depends on the game. They're not solely meant to please others; if they were, games would lack that element of unpredictability and failure that make them fun to play. The GM's also, in certain cases, meant to flesh out the world, and that also doesn't conform to the pleasure of others; if the others really, truly desire jetpacks in a strictly medieval fantasy game, should the GM pander to them?
EDIT: But heck, this is a discussion for another thread, isn't it?