Yes,I found success (win) in gambling many times but most of the times I lost,just understand the many and most so totally we are going to lose our money more than winning here,so if your intention is to make money then invest on something with less risk.
Yes, you are right people should focus on different other things for investment in order to be safe but whereas through gambling most of the time you will be in loss. So don't think that gambling will give you higher returns but ultimately you will lose. To find other possible option where there is less risk involved in it.