This isn't a classified site, folks. It is a forum, that happens to have classified ads. Join and participate, or become a site supporter.
Besides, I doubt that member is "out of a sale". It'll still sell w/o any problems.
Although that's true that this is indeed a forum, I would argue that the classifieds section is an integral part of that community. Try and find an online firearms forum that DOESN'T have a classified section. I think you would be hard pressed to.
My argument is also that buying and selling is a vital part of the hobby. I know I used to do it just for fun. It helps members to meet up with other like-minded individuals.