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.
But with investing it you can also lose it all entirely, so that's the risk and why people suggest you should never invest what you can't afford to lose.
Look where you want invest if you investing in ponzi you can lose your money. But if you invest in property is low risk you lose your money.