A trend has been started that bitcoin is now used only for raising income by buying and selling it but we are ignoring its most important fact that it was created to be used as currency and if it can be used as the currency it would really help community to enjoy its eases and regions who are accepting btc must have to start it as currency this will automatically boost user no's as well a prices,
You are right when you said start using bitcoin as currency will boost user number and price automatically. But why investment mode is used by more people than currency? Because so far not many sites or especially offline place accept bitcoin as payment.