Goldman Sachs Group Inc.’s (NYSE:GS) Sharmin Mossavar-Rahmani, who is the chief investment officer of the private wealth management group at the investment bank, thinks that Bitcoin ETF approval does not make the cryptocurrency a legitimate investment option. What Happened: Mossavar-Rahmani likened investing in Bitcoin (CRYPTO: BTC) to visiting Las Vegas and betting. “If you want to go to Las Vegas, great,” she said, according to a report by The Wall Street Journal. See Also: Bitcoin Hangover After ETF Party: Were Bulls Blinded By Hype? Just like betting, she considers Bitcoin as a “total spec…