Gambling is the fastest way to double your bitcoins in a day or even in an hour if you are really lucky. Life is a gamble anyways so it's up to you to decide on that.
If you can afford to take risk then you should not hesitate in gambling as anything is possible, if you are lucky you can double your coins in just few hours of time.
Yes, bitcoin gambling is highly risky. At the same time if lucky highly profitable. The value might not just get doubled, even go's very high depending on luck and our risk.