Publishers Clearing House is not a scam, although the odds of winning are very low. There have been several scams artists posing as the official Publishers Clearing House, which have tarnished the company's good standing in the eyes of consumers. PCH has worked diligently to report unauthorized representatives from presenting themselves as officials in order to dupe unsuspecting citizens out of their hard-earned dollars.
The real Publisher's Clearing House (PCH) is not a scam, though there are hundreds of imitators out there that have modeled their business like PCH. Those imitators ARE scams. PCH has been around since 1953 and is a legitimate business. If you want to read more about PCH, check out their official blog at http://blog.pch.com/.