I wonder what type of sensible income you are talking about because to the best of my knowledge, their are so many guys out there that wish to invest in Bitcoin that are earning a sensible income as you called it but still can't figure out their discretionary income, what an investor need in other to invest in Bitcoin consistently is a discretionary income and the will to hold for a very long period of time, because if he has the will to hold for the future, he will put down measures that will make him develop a strong holding hands, like having an emergency and reserve funds in place to protect his investment against any unforseen circumstances that may arise in the future.