Ooh, totally disagree. I've made a lot of suggestions on these Boards over the years, and many of them came to fruition. Just for clarity, I'm not saying Rioter listened to me, in particular, but they clearly paid attention to the ideas floating around on the Boards.
I asked for cheaper items so that supports wouldn't have their stuff nerfed because of top lane. Done
I asked for a healing/shielding item for supports so that they didn't have to rely on AP scaling. Done
I asked for sightstone removal so we had a free slot for an item that would actually be useful. Done
So, perhaps instead of complaining that Riot never pays attention to what we want... why don't you just tell them what we want and trust them to see it? Make a thread about the changes you want to see, and see what happens.