The number of ETFs in the US stock market has already surpassed the total number of tradable stocks. Retail investors in the US stock market love buying ETFs. I love buying ETFs too. If you don’t trade US stocks, you have no idea how wild ETFs and derivative ETFs can get. There are leveraged ETFs, and even ETFs with options. Assets that barely fluctuate a few points in a year can, through derivative ETFs, turn into products with over 15% annual returns. Absolutely awesome.