The bigger the risk, the bigger the gain. If anybody is afraid of losing then put the money in a bank or in a vault no risk no gain. Take the risk if you succeed you will be happy if you lose you will become wise. it's a win win situation. But offcourse it defends on how you absorb the situation.
Always be careful of the risk you want to take. A lot of people even on this forum have decided to try gambling out with the chance that they may end up hitting it big. It is a lot of risk too anyway, so I do not expect that one should not expect to see a great result as well.
All the above, there are some risks that are absolutely just too stupid to take, and even if you want to take a risk, you should take one that is well worth it to achieve a big result. It is sure better to try than not to try at all, but if you are trying, also use your brain in the process.