I dont think that not answering guests is the right idea. Everyone of you started as a guest at sometime. Besides just cause you are a guest does not mean that you cannot add something worthwhile. It is just as silly as labeling freshman as inferior in high school. My advice is to welcome the guests and try to promote you club by being helpful to them. This would gain the respect of the guests and in my opinion would encourage more of us guests to become members. There is nothing wrong with being a member to try a club for a while.