On several of my forums we have active marketplace sections, where people can post a classified ad type post to buy, sell, or trade items. Using vBulletin, the way I've prevented excessive thread bumping from being an issue is to make the "Default Sort Field" by the thread start time, not the last post. Thus, a member can reply all they want and the thread doesn't get bumped. I've looked in my Xenforo sites and found no option like it. Am I overlooking something, or does it really not exist? Seems like an easy feature to add into the mix, and one that I rely upon.