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For us to fall into the temptation of trying to withdraw our investment, we have to have other source of earnings because it normal for a person to be in need, but you decide to invest in bitcoin you should have it in mind that it is unusual for you as a person to tamper the funds for a particular period of time and this will be for your own good, don't be premature decision take when it come to Bitcoin investment.
When you are out for bitcoin investment there things to avoid, like making fast decision in terms withdrawing funds, no doubt situation may call for such but they only way to overcome this inevitable situation is to make sure that your income can sustain and caution whatever may arise so that nothing will warrant you to think about withdrawing your asset to solve problems.
As the case may be, even though the money grows to a tempting stage, if you must withdraw for anything, let it be for another lucrative investment not for lavishing purposes.
First... You should try to set yourself up in such a way that you are never tempted to tap into your investment.. yes emergencies happen all of the time, but they happen more often when you do not prepare yourself and they happen less often when you prepare.. and yeah, maybe you are in a kind of shitty situation in which you barely have enough to invest into anything, and maybe in those kinds of circumstances, you might not be ready to invest into bitcoin.
Surely, I try to suggest to everyone to get started investing in bitcoin right away, but people have to take responsibilities in terms of making sure that they are not over investing during periods in which their emergency fund is either underdeveloped or has been depleted, and these are judgement calls regarding how to deal with matters.. and whether still buying $10 of BTC is good for that week or maybe that $10 needs to be kept so that there is enough of a cushion in the finances... and yeah, if you have $500 in expenses every month, and you ONLY have $300 income, you are not in a very good position to be investing into anything, unless you happen to have some kind of reserve of more than 6 months that you could justify continuing to invest.. so if your reserve is more than $3k, then maybe you could invest some of that excess into bitcoin, and make sure you get your cashflow up to $500 per month or reduce your expenses so that you are taking from your discretionary/disposable income rather than dipping into your reserves.
Second.. there is nothing wrong with using some bitcoin in order to invest into other projects, but there still might need to be some weighings regarding if it might not be better to just keep the value into bitcoin and to grow bitcoin or to get money from somewhere else or to decide that you don't have enough money in order to invest into that other project. It is not automatically going to be a good money to draw from your bitcoin, even if there might be "supposed" "opportunities" coming available, because there are always going to be "opportunities" for people who have grown their wealth as compared with people who have not, but the mere presentation of an opportunity does not mean it is a good idea to draw from your bitcoin, even if bitcoin might be seeming to be at a price peek.
Of course, the more that you get your bitcoin investment figured out, and the more BTC you accumulate, then there might be some justifications for you to take 10% or more from it, yet the more you take from your bitcoin stash the more you have to consider the possible trade-offs that you are making when you do that and if you are still in BTC accumulation stage (or even fairly early BTC accumulation stages), then you might have to have a pretty decently strong plan to replace the BTC that you had taken within a reasonable or an expedited timeline.