Bitcoin is all about taking advantage to invest and be profitable at it, this may come by any chance and at any time, for us to be an investor, we may not have to depend on having a discretionary income which some also called a fixed source, instead we can have one or two sources to the income being generated, then plan on the accumulation pattern for our asset and device a strategy to use like DCA, which could best be applicable as at when we are capable enough to buy and hold as the market dips and as we are having our income flow coming.
Could this be another way of saying having a plan to consciously use DCA without having to depend solely on discretionary income? I agree with you only when there are other sources of income. For a skilled person whom in most case earn high or someone who can carryout multiple jobs before the end of the month it's much easier to apply DCA without depending on discretionary income because they have constant flow of money.
But a scenario where this opportunities are rare. I mean having the chance to earn more income then the only option is to depend on the available income which in this case fall back to the discretionary income.