Just to keep it alive! :
got contacted by a possible buyer, asked me to reserve and check a watch i have for sale, tells me he wants to purchase it. I tell him "sure", no problem, i reserve it for him until next morning and see if everything works well. It does, i send him a pm, he never replies.
Mate, if you change your mind, thats fine by me, but at least, you could send me a pm saying: "sorry, i changed my mind, but good luck with the sales! "