Which buyer earns a top priority standing, committing the seller to complete the deal with him?

Would it be the first to post, "PM Sent" or "I'll take it for your asking price" or these other situations?

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Selling Priority Goes To
Only one choice allowed (67 total votes)
1st person who posts "PM sent" regardless what the PM says - 10 (15%)
1st person who sends a PM saying he will buy at the asking price - 40 (60%)
1st person who sends a PM with a question about the item - 4 (6%)
1st person who makes an offer, even if it is for less than the asking price - 2 (3%)
Seller's choice of the best situation for him - 11 (16%)
Voting on this poll ends: Sun May 12 2013 08:00 PM
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Jim "Oldgas" Potts
Your host and moderator