I have very little patience for a buyer who posts "I'll take it" then starts asking questions, I might answer one volley of questions, but if the questioning continued I would likely move on.
The most likely buyer is the one who knows what they're looking at, knows what it's worth and trusts the seller.
Those of us who snap up great deals right away have reached a comfort level with the other forum members where we feel confident we're getting a great value for our money, we don't ask a lot of questions because we already know the answers.