If you save your money then it's amount will remain the same.
But in case of investing it, you can increase the money, may be many folds.
Higher the risk and higher the return.
Problem is all people do not have enough savings. If you are not able to save sufficient amount of money from current job to invest in bitcoins, it is better to look for additional sources of income. You can get another part time job or do freelance work online. There is no shortage of work provided you are ready to work hard and adapt to the changing scenario.