A report from the lunatic fringe of fund investing By: CNBC.com News September 17, 2014 at 08:00 AM EDT With 1,600 ETFs on the market, more (and more) of them are pushing the limits of investing (and common) sense. We put some oddball ETFs to the test. Read More >> Related Stocks: Alphaclone Alternative Alpha ETF BlackRock Facebook G-X Nasdaq China Tech ETF GX Guru Index ETF GX Social Media ETF Gold Trust Ishares Groupon Cl A Las Vegas Sands MGM Resorts International Nasdaq Smartphone Index Fund FT Nutrisystem Inc SPDR GOLD SPDR S&P 500 ETF Trust Tesla, Inc. Twitter, Inc. Wynn Resorts