I disagree. From my experience once I say I am going to sell something to someone, The person that asks first, I wait a reasonable time for them to pay. Then if that person does not pay within a reasonable time, I move to the second person after telling the first person what I am doing to give them a second chance. We all depend on our word here. That is the only way it works. That includes first person who asks should get the goods. Of course this is my opinion and who the heck am i?