I don't think I agree with your concept in saying that we need only discretionary income to invest in bitcoin, you can invest in Bitcoin using different income strategy, as long as it suits you financially, however most persons use discretionary income to invest because that's the spare money they have after spending on other necessities, this not to say that people who use discretionary income to invest with the mindset of reducing risk factor are out of place, but saying you only need descriptionary income to invest for me is out of place because there are individuals who intentionally want to spend huge amount of the money they have in investing on bitcoin not minding the risk factor others might shiver about, this is because Bitcoin has over the years proven itself that it's worthy of such trust.
I disagree with you dude, because no matter how much someone wants to invest in Bitcoin, that funds must come from the person's discretionary. Remember that an Investor always allocate funds to different needs and wants and these funds should be used for a specific task and so using money outside your discretionary is not advisable and it is a wrong investment and JJG has explained this before now. Even when we want to be aggressive, it is our discretionary funds we will use to...
I believe that these two sides here are pointing at the same truth in two different directions. The thing is that good Bitcoin investment is reduced to risk management, and this is why discretionary income is frequently suggested to people, as it means that you will not be forced to sell all your assets to panic in case the costs of life will appear. Meanwhile, there are more highly-convinced investors or better-financially-shielded investors who make far more aggressive allocations, and history tells us this has been successful in the case of some of them. In my own case, I would consider DCA with discretionary funds as the most secure long-term course of action, whereas I would consider dips as an opportunity to be a little more aggressive provided that your financial capabilities permit it. In that manner you would develop progressively without putting aside money that you could require the next day.
I think misconception is what is awakening this argument but I think I get Spaceman1000$ clear and he is right with all being said.
There are certain investors with diverses of income who has income flow enough to invest on bitcoin without being said to consider settling immediate needs first before using the remainder to invest on bitcoin. It is all about being drastic and investing strategically. So such agressive investor can decide that a particular income from a particular source would do the responsibilities of essential needs in the short times and then, he can decide to invest on bitcoin with the other incomes from the other sources. By then, discretionary incomes will not be a thing to be considered anymore as it responsibilities has earlier been put to place.
This is about the size of your bank rolls so if you have less diverses of income, then your investment strategy should be a different sense of financial managements. But in summary, all of it are discretionary because, the essential needs would always be considered first before move to invest on bitcoin.