People are willing to risk so much because they believe that no risk no gain sought of phrase, and as a result they can risk all they have at the moment just to be able to hit something big in return. But yet they fail to consider that without them being in luck for that day all their efforts could be going to waste leading to them losing all they are risking leaving them with nothing. Some gamblers can be so pathetic.
No Risk no gain does not mean you will not be mindful fo the risk you take, if you take every risk because you feel that way you will make gains, you may end up loosing everthing and still not make the said gain. So be very mindful with your risk so you don't loose out too bad. Desperation sometimes leads to some of the pathetic behaviour you see with some gamblers. But some of them do get lucky while the others just keep their hopes on luck .