I recently rewatched No Country for Old Men and a certain line has been bugging me. At the end of the coin-flip scene at the gas station, Chigurh tells the owner not to put the lucky quarter in his pocket, for then it will become just a coin. As he walks out, he tells him, "Which it is."

What is the significance behind this line? It's my understanding that Chigurh believes strongly in the laws of chance, and this governs the way he acts. His insane conviction is evidenced when he tells the owner of the station to respect the coin, but telling him in the end that it's just a coin seems to go against what his character represents. Is there more to this that I am missing? Is the statement there merely to show how he sadistically plays with his victims?