Bitcoin or not, it's not advisable to throw all your resources into a single investment. For in the same way we advise people to find themselves into more than one means of making income that is how it has to be with investment assets. You have to spread it to other areas while you still have a source of income to cover for daily needs. Op, your friend have to realise that there are bearish season with bitcoin and how does he survive in those periods since he has quit his artwork which was a source of income he once used to invest into bitcoin from the beginning.