Any threshold is wrong.<p>Votes are a currency with which users tell each other what their feelings are, setting some arbitrary limit on that ability to express means the underlying system is broken.<p>Either voting works as a mechanism to identify quality content, or it doesn't.<p>If voting is to be limited to those that want to engage in group-think (the quickest way to boost your average is to post stuff people will find agreeable) then we'll soon have very bland conversations here.