From my personal experience, ~10% of the threads in G%B are legit. They have people who bring good points and arguments, discuss civilly, and are open-minded to discussion. Hell, if those 10% are found to be wrong in their argument, they actually have the manners to admit their fault. The reason why their ideas, however, don't make it to Riot is because of the other 90%.
That other 90% are toxic bronzies who don't look at other people's opinions. From what I've seen on these boards, they are a bunch of little children (or, if they claim that they are 30 and have a job, mentally retarded and at an age of 7) who bring up zero valid points. You know what I saw on a topic right before I posted here?
Title: Nerf Fiora.
Body: Go.
This person didn't even try to give reasons why to nerf Fiora. Most likely, from what I can infer he got wrecked hard in lane and didn't know how to counterplay her, and thus came straight to the boards to whine like a little child. It's because the majority of the boards are dominated by these vocal, ignorant children that Riot doesn't listen wholeheartedly much to G%B. Which leads to the typical stereotype and G&B is filled with ignorant fools. You also have to note that it is the same people making these ignorant threads that are making these ignorant comments.