I like penguins, bottles of Macallan Gold, and eating copious amounts of red meat. This has triggered more interest in an alternative currency such as Bitcoin as its value is not controlled by any government. Derivatives have all sorts of flaws and open up all sorts of risks you may not wish to take, but they have a purpose. While Bitfinex can be helpful for buying large amounts of bitcoins, it is probably best to not use the exchange until it fully compensates affected users.