The block off dancers

I wanted to talk about the "block off" dancers . The ones that come to your table knowing that you don't want to get a dance from them so they decide to sit down beside you or at your table thereby making other dancers think you are occupied when you aren't. These dancers seem to think by them sitting there you will eventually break and decide to ask them for a dance. I really get annoyed by it but I keep it to myself. I never understand why a dancer can be so stubborn and not get the hint. By wasting their time on someone that is not interested they waste their opportunity to get other customers. Ultimately when you they know you won't budge they finally get the hint and move onward. Never let a dancer see you break because they will try again and others will pull the same move.