Of course there's nothing wrong with helping people, but that's not the same as being the self-appointed guardian of the CL classifieds. This isn't defending the helpless, they can do the research as well as we can. That being said, calling out someone who is purposefully trying to scam someone by trying to pass it off as something it's not (and they know it) is different. That's actually pointing out dishonesty as opposed to disagreeing with a price.