If the advertised price is met by the buyer, it constitutes a deal. That is not the point though. The point is that the buyer as a person can not be declined because he is a scheisser... That would be like putting a "whites only" sign on a public crapper. The door is open, so whoever wants to relieve himself can go...
The argument is about the person buying and NOTHING else. If a poephol offers the advertised price, on what grounds will you turn him away? It's sold already? It's not for sale anymore? I have it but YOU can't have it because you are a d**s? Maybe, but that would be unacceptable IMO.
Most people are like clouds. The sun comes out when they f*ck off...