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You are right for the fact that Bitcoin is still growing it is never advisable that when one has accumulated enough he should sell off all his Bitcoin the best thing to do is to withdraw little by little, my own reason for saying that is that a growing asset like Bitcoin has big potential and you selling all your Bitcoin at once may lead to you regretting in the future, just imagine you have accumulated enough Bitcoin and you decide to sell off all your Bitcoin and at that time bitcoin is $150k and after the sell a year later Bitcoin hits $250k or $300k I'm sure you will feel a little bit of regret in you but if you had sold only some of the Bitcoin you will still profit from that rise with the once you kept.
The point is that you don't have to close your Bitcoin investment by withdrawing all of your accumulated Bitcoin, let it be an investment you should keep growing when you have accumulated enough you may decide to keep holding or you may still decide to be accumulating more maybe only when there's a dip, you can sell but don't sell all, entering into some kinds of a sustainable withdrawal will surely be nice and help us maintain our investment.
I doubt that the point is whether the BTC price might go up or down, since I doubt that it is good to potentially reach a status of overaccumulation and then start to trade bitcoin rather than having a practice that is more regular and ongoing.
Let's say that on average a bitcoin investor has been investing right around $100 per week in the past 9 years, and over that time, his income has gone from $30k per year to $40k per year, and so
in the past 9 years he had invested $47k into bitcoin, yet at the same time he has accumulated close to 12 BTC. He is thinking that he will stop working once he concludes that he can sustainably withdraw $80k per year from his bitcoin investment.
Right now, he feels that he is not quite to that level, since right now 12 BTC would only get him around $54k per year in income, and so he would prefer to have a wee bit higher income, which he thinks that if he either keeps buying bitcoin or he just waits for a couple of years, then his bitcoin holdings will be at a status in which he can start to sustainably withdraw $80k per year, and he is not depending on withdrawing large portions of his BTC in order to accomplish such sustainable withdrawal.
In other words, why spend 9 years building up an investment in one of the best, if not the best, investment asset known to man, and then to sell large portions of it, when bitcoin has much more promise to continue to generate income based on staying invested into it rather than fucking around by trying to trade it. One way to convert a solid investment, such as bitcoin, into a loser is by selling too much too soon... especially since with the passage of time, bitcoin's investment thesis is not getting weaker.
Yeah is very wrong for someone who has accumulated enough Bitcoin to sell off all his accumulated Bitcoin at once because it will lead to regret, Bitcoin is still a growing asset, a lot of people who sold out all there accumulated Bitcoin in the past are now regretting there action in this present future, selling off all your accumulated Bitcoin is a wrong move.
For me even if a person has accumulated enough Bitcoin is still not right to stop accumulating, you may stop accumulating regularly like you where doing when you started but don't stop accumulating you can decide to accumulate only when there's a dip to add up to the already existing one you already have that way you will never run dry of Bitcoin, I believe if you have reached the stage in your Bitcoin investment that you can now start selling you shouldn't also stop accumulating, you can't stop watering a flower no matter how long it has stayed especially in dry season so is Bitcoin investment and every other investment in the world you most keep adding to it if you want it to continue.