I thought so - the reason the "for sale" threads is that XenForo does not have a classified piece of software, so it was decided to create the "for Sale" forum.. I had the opposite problem, I said the sales items were getting buried in the feed and suggested the "sidebar" where you could link to the various threads.
IIRC you can optout of any forum - I will leave it to smarter people than me to tell you how....
IIRC you can optout of any forum - I will leave it to smarter people than me to tell you how....