It is difficult to get one source of income, let alone a source of income that is good and viable enough to carry investments. I think that mostly for Nigerians trying to invest in Bitcoin would have to be made from a place of sacrifice because only few Nigerians enjoyed the privilege of having sufficient amount of money that accommodates their lives need and then some for investments the rest of us have to struggle our way into investment by making sacrifices and budget cuts when necessary. You do not need more sources of income to start investing you just need to learn how to make more sacrifices.