Having multiple sources of income is good to make available more discretionary income that we can use to invest into Bitcoin. However even the funds from the multiple sources aren't managed properly by being as aggressive as possible without overdoing it and building out our emergency fund and other variances of backup funds in the process of accumulating Bitcoin, our portfolio still has the rights of being tempered regardless of our multiple sources of income.
The purpose of having multiple sources of income is so that you can enough income streams by the end or before the month. For someone not to manage enough income stream, it is possible that no matter the amount he has in life he wont be able to managed them properly. Most investors find themselves in a position where other investors wish to have.