Bitcoin is a good place to store money as if price goes higher then it will also help in growing your money but make sure that you don't put all your money in it, as it will be risky if price drops in future.
Aren't we trying to promote bitcoin as an official currency of the digital generation ? 
I get it,bitcoin is a easy alternative to invest a few bucks but you'll are forgetting the cause why it was ever invented.90% of the bitcoin related posts around the forum are only containing keywords like "invest,trading,profit,double" etc.
Yes that is the idea. Just put the excess money if you have some spare. Actually it is the best storage as it is also an investment. No need to go to a broker for you to be invested or in a bank. Just putting some money in bitcoin it is already done.
Bitcoin is an experimental currency.You're putting it like before the dawn of bitcoins people never invested in digital assets before.