“Last December, Bundesbank’s President Jens Weidmann told Wirschaftswoche that bitcoin was not an alternative to national currencies and that bitcoins were only used as currency in certain niches. Weidmann stressed that the driving factor behind the demand for bitcoin was the hope of big payouts, which may prove elusive for most investors. On Monday, Bundesbank board member Carl-Ludwig Thiele told German financial magazine Handelsblatt that bitcoins remain highly speculative, as they are as volatile as ever. Thiele maintains that bitcoins are an exceptionally risky investment. He also pointed out that bitcoin investors have absolutely no guarantee in case something goes wrong.”
http://www.coindesk.com/german-central-bank-official-issues-another-bitcoin-warning/