I agree that a person should not be dipping into his emergency funds for BTC buys, but there could be situations in which it makes sense if there is variability in income and expenses, and there is also a decent sized emergency fund. There also may be decisions to buy a certain quantity of BTC no matter what, so if the cashflow over several months is fluctuating, the income might not meet expenses, and yet there still might be expectations that the following months or the month after, the emergency fund will be able to be diminished with the short-fall, and part of the reason to have an extra large sized emergency fund is to be able to buy BTC every month/week. . or whatever might be the priority that is pre-established.
Anybody that uses funds for emergencies to invest in Bitcoin is not a wise investor because problems can come at anytime when he/she will need some money that he will use to settle down some things that needs to be settled..
Having an emergency funds might make an investor to hold more longer than he or she planned to hold. Reasons are because when you are saving and still accumulating Bitcoin and on the other hand you have funds for emergencies, then what will the person want to sell his coins for? Nothing,,, unless they will want to use some of the profits to complete a project and other things that can be bring more money to them during the week or month.
That's the more reason why any Bitcoin investor should scrap out some money from their earnings that will stand as emergency fund should the need arises rather than tampering with their holdings because if they tamper with their holdings then their motive of accumulating more Bitcoins will be conquered because they gonna keep tampering with their holdings from time to time until they exhaust all their holdings so it is important to always plan ahead should in case things doesn't go as planned.
There is also a possibility that the rich investor who has the money to invest at once and don't bother investing for the next 20 years can still has more Bitcoin in his portfolio than the poor investor who is invest 20 dollars every week. If a rich investor spend $500k and buy Bitcoin at once, someone buying at $20 every week for 20 years won't have same holding as that of the Rich man. Yes consistency in accumulating is good if you have the time and money. Also buying at once and don't bother buying again is also good. What matters is the size of Bitcoin you bought at once and your holding duration and the target you want to achieve.
Inasmuch as Bitcoin is a volatile asset, investing on Bitcoin with a fixed amount without having to invest again may not really be a nice idea because it may be difficult to accumulate as many as possible but buying consistently can also give an edge to accumulate as many as you can be able to afford if you DCA and moreover if one continues buying consistently you can even surpass someone that bought at a fixed price and never cared to buy again. Most times, buying at regular intervals helps to keep your holdings updated rather than stagnating it at a fixed price for a long interval of time.
There are some people who works in a company that don't pay workers salaries on time (delays payments) and those people if they are invest in Bitcoin and they are not saving some funds for emergencies and just saving for nothing, by the time month end and there is no payment they will want to sell some coins and use the money to support them self untill payment is made.
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Depending on salaries alone is not enough to buy and hodl especially when you are using DCA because in the course of your salaries not coming at regular intervals it may affect your DCA so it is advisable to also have another medium of earning an income that you can be sure of at the end of the day so that it wouldn't affect your investment goals. Having external savings from your earnings is also very important so that in a case of your income being delayed, you can just go to your savings to sort out yourself.