Yes, they listen, but they are making THEIR game, not yours. They take all input and decide what THEY want to build. There is no way that they could include everyone's suggestions. It is literally impossible since so many of them contradict each other. Instead (according to his GDC speech over a year ago), Soren took a snap shot of the forums and what people liked and disliked from Civ3 and the suggestions listed, and looked them over before designing this game.
Am I satisifed? Sure. I don't realistically expect them to build MY game. I'm not paying them that kind of money.