Do you mean 'here' as in the forums or as a part of the clan? If it's on the forums, I don't see a big deal with folks joining up here for a little discussion that may lead to their future participation. Or, say they're a part of the clan now and later lose their internet or they have an xbox malfunction and cannot play for a long while....
Things like that must be considered before banning someone from the forums or from the clan all together.
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I like hearing myself talk, it is one of my greatest pleasures. I often have long conversations all by myself and I am so clever that sometimes I don't understand a word of what I am saying.