Maybe we should have a requirement list before an ad is placed. Like Mark44 said, price, location, and pics would be my top three choices. If you don't have those, you can't post the ad. In fairness to both parties (buyer and seller), it's doesn't give everyone an equal shot at getting the part without all the information. The responsibility should not be put on the buyer to find out all the details while giving someone else, who doesn't care about those details, the opportunity to purchase the part. 'Tire kickers' happen a lot of times because the seller doesn't provide complete information. This is why it may be a good idea for those three items be posted at the time listing the ad.
Doug
P.S. Maybe add paypal address as #4 to the requirement. This way, there would be no speculation who paid first. If someone else paid but they came in later, just refund the money.