I can't speak for everyone, just tell you what I do. If someone posts something online and people are stating that they are going to call or go get it, I don't respond to the ad even if I am interested. Its simple to me, its only a grill. I have several of them and not getting one more is not going to end my world. Now if someone posts something about one and no one states that they are interested in picking it up before I see the post, I might make my intentions known in the post, but it certainly isn't anything to get bent out of shape over if someone happens to nab it before I can. Sometimes deals work and sometimes they don't. There always is another one come along. My suggestion is if you see something you want, grab it and then post about it.
Everyone I have ever met or dealt with on this board seems to be a great person and always willing to help out another board member. In fact, its one of the main reasons I frequent this board as much as I do.
I am sure that does not answer your question to the extent you were looking for but hopefully it will give you an idea.