I have never heard of a barn that dont let buyers on the property. And, ain't no body that could stop ME from selling MY cattle to whomever I wanted to.; The buyers or traders....whatever you wanted to call them... are a vital part of a successful auction operation. The sale barn gets paid either way, whether someone sells to a buyer when they come up, or whether they wait hours to run them through the ring. Never heard of anyone calling them pen hooks, either. Sounds like it is...or some say it like it is... a derogatory term. If it is in fact, then you won't come to the barn and call a buyer that at any sale I go to. Not where he can hear you, anyway. Traders won't get run off the property, but no manners or rude behaviour will sure get you run off., Or carried off.