I just saw an article in the Guardian (https://www.theguardian.com/business/2017/nov/30/bitcoin-is-a-vehicle-for-fraudsters-warns-goldman-sachs-boss) where it states that Goldman Sachs CEO Lloyd Blankfein says, after a 20% dive in prices that bitcoin is a vehicle to commit fraud.
"Lloyd Blankfein, chief executive of the US investment bank, said: “Something that moves 20% [overnight] does not feel like a currency. It is a vehicle to perpetrate fraud.”"
Which is OK if that is his opinion, he is entitled to it, but I remembered having read something else and I came up with this headline on CNBC.com:
"Goldman Sachs exploring bitcoin trading operation
Goldman Sachs is looking into a new operation for trading bitcoin and other digital currencies.
"In response to client interest in digital currencies, we are exploring how best to serve them in this space," a Goldman spokeswoman said.
Unlike JPMorgan Chase CEO Jamie Dimon, who called bitcoin a "fraud," Goldman's technical strategist has published analyses on bitcoin's price."
So the conclusion I can come up with is bankers will say anything they want and don't take anything they say too seriously, they "surprisingly" don't actually have your interests at heart.