Bitcoin is most popular cryptocurrency. It makes great price movements and therefore allows business to speculators, but also is an increasing value asset. As you know bitcoins number is limited by its algorithm, for this reason the value is mathematically destined to increase if the interest in this currency remains the same and as you see, the interest is increasing day by day. So we can consider this asset as a good investment.
Banks give you no more interest? Your funds feel no secure in your banks? I understand. They are unfair, expensive, obscure, non-transparent and not-client oriented entities. This is why more and more people is interesting in different and technologically modern assets for doing their business with.