With the share market we are believing some third parties for our profits whereas in gambling, we are relaying on our own skills to make profits. I do believe on my own capability for my fortunes than others.
In stock market, you can rely on professional fund managers to manage the money for you. But those manager on average will be worse off than the index track funds.
In gambling, only very few professional gamblers can make a living. Most of the gamblers can only have fun, not the money.
If know more about company how it works and whether company products got any demand in future than you can decide by yourself after doing some research no need to go to these fund managers but if you do not have that knowledge then we may need these professionals help. Basically when we depends on others than it is not fully safe investment.