buying or holding a bitcoin is also a investment and also it has a risk because you spend and risk money just to make some profit and try if your money will grow . you should think twice before investing your money .
The important point about investing is that you have specify your strategy such as do you want to invest for long term or short term and also do you have high risk appetite or low risk appetite?
I kinda like long term investment because I believe as a small investor our chance to make money is doing such, with long term investment especially with BTC, we will have a good opportunity to increase our investment more than a bank can offer.