Personally, I don't think for sale ads should appear in the "new posts" list at all. When I want to look for stuff,..........and I do..........I go to ebay, CL, or the "for sale" ads. One here. And other places.
"Carpet bombing" is a great description. Last couple of days hitting the "new posts" button results in more than 1/2 page of "for sale" ads that you must scroll through, page after page.