What's the best money making scam you've ever come across?

The biggest and best money making scam in the world is religion. All religions were begun thousands of years ago, and are still going as strong as ever, and all are still collecting money. No one really knows for sure where the money goes, and it seems that no one cares. Governments of countries all around the world, let religions off without taxes on the money they collect, and on the buildings they build to conduct their business from. Imagine a business that doesn't pay (and has never payed) one centime of Taxes. These religious business organizations put the money they collect out at interest,to collect more money. Everyone knows that religion is Faith Based. This means that there is not, and there has never been, any physical proof for anything they say about the basics of their business, but once again nobody seems to care. Religious people just keep on losing their money to the Biggest, and Best Scam of All Time!