Signatures do not affect the discussions about BTC and other things on the forum, as far as i have personally noticed, most of the best posters are on signature campaigns, and i learn a lot about BTC from them, why would i mind if they wear a signature or an avatar, i only care about what they post on the forum. People who don't like sig or avatars have them already disabled in their profile, and if you see spam posts report them to the moderators.