When it comes to trading or investing in Bitcoin having a source of income is very crucial...if you don't have a source of income you might end up spending your investment because you won't have the patience for it to appreciate...This is the reason why you must have a source of income so you don't make terrible decisions.. Another reason why you must have a Source of income is, thr crypto market isn't stable, there's a possibility that the price might go down and if you have nothing to fall back to it will be a problem