
It is true that many people always lose money in the financial market. Even if they sometimes earn money, they will not be able to get any money from the market at the end. Some people had tried investing but lost much money and left the market, while some people heard about their friends’ experience and learnt the lesson not to try investing. So it is reasonable that people refuse to put money in such an unsafe place.
Nevertheless, all these are because many people do not really understand what investment is. In fact, they are not doing investment but gambling.

If people really know how to invest, they will probably not lose money all the time. By studying your investment and with your experience, you will know why this stock drops and why that stock rises, thus you can make the best response but not just wait there. I cannot guarantee that you can surely earn money, but at least you will learn how to minimize the loss and maximize the profit.
I know there will always be some risks in investing. You cannot determine everything, accidents always happen! So I think it is better not to put all of your money in the market.

I know there are some people who are not good at investing or studying them. I will not recommend you to invest a lot, but you can still invest some in some riskless financial assets. It is far better than just put money into the banks, since the interest rate is extremely low which is nearly zero. We should anyway do some investment to compensate inflation and to prepare for our future lives. Thus I strongly advise you to do investment, but in a smart way.