What does your common sense tell you?

Hi,

I just want to check with fellow audiogoners regarding the sales practice or sales etiquette here.

When you are a seller: Someone sent you an email saying he is interested. You kindly reply, "thanks for your interest. If you would like it, please let me know how you want to pay." A few hours later, other person contacted you saying he would like to buy. You kindly reply, "there is other person showing interested. If he backs away, I will contact you. Thanks for interest. Blah, blah, blah". Now you wait for the first guy to reply. After a while, you email to the first guy, "now, some other person is waiting for your decision. Please let me know of your decision as soon as possible by tomorrow morning."

OK, here is the question. The first guy never replied by the time you designated. Then, would you allow yourself to start contacting the next guy because you waited long enough? What if you close the deal with the second guy and the first guy comes in after two days and says, "I want to pay by MO and send it to you tomorrow."?

I don't want to piss anyone off here, let alone be sued on "Dispute" section. Please let me know how you would behave in one of these situation.

Thank you.
Ken