Yes, it does occur way too much but when it does, if members would report it, it will usually get taken care of rather quickly. There's only a few mods trying to make sure a huge site run smoothly but we also have lives of our own (for the most part) and can't always be on the site.
Yes,it's definetly not the fault of the moderators. People just don't seem to read what people post and do what they want. It's happened so far everytime I've posted a wanted ad here. Human nature I guess.