I think the point novioman is making, is that some sellers appear to ignore questions, even when renewing ads.
Thing is, often when questions are asked, the information requested is usually relevant to everyone here, such as when a seller says collection only & then fails to state their location for said collection.
Alternatively members, myself included, will ask a public question because of a concern of the validity of the ad, or even the seller themselves, again this is usually intended just to give all interested parties a heads up to do due diligence before agreeing a purchase.