If you hit the report to moderator button in the same thread for the same post your compliant will more than likely be ignored. If you hit report and leave a comment like "I don't like this" no one knows what that means. If you hit the report button in order to spam a link, no one sees it but mods and it's just deleted. If you "report to moderator" daily (some people do or come real close) none of your concerns or complaints will get any attention. It's annoying and it also means you're an idiot.
Hope this clears things up.