Well.. bitcoin is certainly not for investors. There are a lot of local businesses that accept bitcoin and some people actually prefer to pay with it even if it is just for the privacy feature.
You mean not ONLY for investors right? Well definitely bitcoin is for everyone no matter what the individual case is investors, businessman, CEO, etc. there is no restriction in using bitcoin unless your country did prohibit it lol.
Bitcoin is still in an early phase and does not YET benefit from massive institutional liquidity like commodities or forex pairs. This is why we see these sometimes violent price swings. Due to the scarcity of Bitcoins it is not likely that we'll see BTC at these prices when institutions will pour their money into the market.
Violent price swings? I don't think violent is the right word for mix mass speculation, it will be only violent to you when you expect misaligned to the outcome such as investing then opposite direction movement happens. Scarcity of bitcoin, low limited supply will enable it to soar up high in the future.