At present situation government actually not so much concern about such kind of currency for that reason people are not so much interested for using this currency. it is now use as a electronic currency though computerized system.
in terms of purchase and sales bit coin holder's are safe but the lack of proper monitoring system by implementing different protocols client are demotivated for using this currency on investment projects.Every country's government should established a policy for securing those client who are holder of bitcoin like an cash or deposit account holders and this types of policy help to motivated bitcoin holders for investing different sector for establishing new entrepreneur in order to development of economical condition.
I think Bitcoin is not so safe in terms of investment, it was too risky. We all know that Bitcoins are extremely volatile, its price can change every single second; but I believe that it will never loose its value. Therefore it can be good for short and long term investment but expect that you can loose your money through it. The only thing we should keep in mind is too invest the amount you can afford to loose.