To understand why you must understand the tax code. You can write off any investment losses. You can also recover losses if its from fraud. Though usually not fully. But you give 1 million for investment, boom its a fraud, and you get $800,000 back as opposed to keeping a million and paying $400,000 on it in taxes. It's a win-win situation. There is no penalty in betting on fraudsters. Whether this guy's schemes are deliberately for that is debatable. But on the flip side, putting downsides to investing on possible fraudsters considerably hinders any new genuine start up ideas from gaining investors.