There has been a rush of hedge funds suddenly converting to so-called “family offices” in the past few months.   Scott Bommer of SAB Capital, which had $1.1 billion in assets at the end of last year, said in a letter he’d return investor money after 17 years of running his fund, Bloomberg reported. He will now focus on managing his own money, the report said.  They join a handful of hedge fund industry titans - including Stanley Druckenmiller, George Soros, and Steve Cohen – who have been running their firms as family offices in recent years. There are a few reasons why a hedge fund manager...