It's when it's ONLY "Is this available?" that it's a problem. It's a reliable indicator of how much a buyer is actually interested in buying what you're selling.I don't understand why "Is this still available?" bothers people so much. If sellers reliably unlisted things they sold or mark things as pending, buyers wouldn't have to ask. I don't want to type out a list of questions if you're going to no reply me or say someone's on the way to come get it. Usually I'll start off with a question or two just to see, but it's really an "is this available" in disguise.
As a buyer, I'll usually ask the seller up front when is the best time for me to come to them, in addition to asking if it's still available. To a seller, that would indicate sincerity in expressing interest, and not just jerking them around and hitting the easy button on something they're not serious about buying (or cannot afford).
As a seller, I'll maybe get 5% follow-up when I respond to a "Is this available"-only message. About 75% of those follow-ups well be tire-kicking questions without setting up a time to come view the vehicle in-person and ask the questions THEN.
And in other news, 65% of statistics are made up on the spot.