Some exchange traded funds are just plain dangerous, and investors should not be lured by the “siren song of ETF marketers,” according to Dave Kansas’ Wall Street Journal article, “Exchange-Traded Funds Gone Wild.” Leveraged ETFs are unusually volatile and high-risk. They are designed for day-trading and unsuitable for buy-and-hold investors. All 52 leveraged ETFs in existence since Jan. 1, 2008, have lost money, according to Morningstar.