to make a living all you need is hundreds of bitcoin in your wallet, invest it or sell it when the bitcoin are high, hold it when the bitcoin are low, I think this system make you a living, do not engaged to the gambling site for you not to lose you're bitcoin, may be in trading you can earn some bitcoin to continue the flow of bitcoin to your wallet,
If you want to earn a living from bitcoin then I think you need to invest huge capital at initial stage as only earning from signature campaign will not help, but if you are an active trader then you can earn profits regularly.