Good point, many times people think of diversification only in terms of their portfolio, but it is also important to diversify our income streams, many people depend exclusively on their jobs to get some money, but regardless of the amount they earn if at some point they are fired they will find themselves facing huge economic issues really quickly, however if instead we have two or more income streams if one of them dries up we have another ready to help us out soften the blow, until we can find yet another income stream to replace the one we lost.