So basically you are saving if Bitcoin reaches 10,000 dollars it would be a bad idea to sell. I disagree with that. I am not saying sell every coin you have but it would be worth it to sell some of the coins. What if Bitcoin stays at $240 dollars for the rest of time, and you have 10,000BTC. It might not be a bad idea to sell some of those coins and make some actual fiat cash as well. What if Bitcoin crashes, then the best time to sell them would be now. There are plenty of times you should sell.
This reasoning may have value if you have big quantity of bitcoins. If you have few (for example 10 or 20 bitcoins) this kind of behavior is not possible. If i sell some of those with the actual price they don't give me to much. On the other hand I "lose" my bitcoins which I think could have much higher price in the future. I write "think" because are qualities of it which make me to hope that bitcoin might have a much higher price in the future).
I think it still works in small amounts. If I have 5 Bitcoins and the value reaches 10,000 dollars, I sell 2 of them for 20,000 dollars. I still have 3 in the bank technically. I don't think that is the worst thing in the world you could do, also could try investing those to make more or something like that.
You did not understood what I had written. Your reasoning it is my an example of a part of my advice. To wait the high price and then to sell. While him wanted to sell some in these days when the price is about 240-250 us dollar one bitcoin and to save some others for the days to come when the price is waited to be much higher. Your example show what it will happen if the previous author of the post will follow my advice. So to wait and to sell when the price will go high (as you have shown).
Then I tell that his choice make sense to be applied if he had big quantities of bitcoins. In this case he can sell some of his bitcoins and this don't "hurt" to much him because he have to many others which can be sold when the price will go high. But even because the amount of money that he will have from the bitcoins which can be sold will be relevant because the bitcoins sold there were be not few. He have to many bitcoins and will sell part of those which are not few (he have a big quantity of those and "few" from those are not few indeed).
But if its quantity of bitcoins is low doesn't make sense to do this because he can sell only few of those (in this case the meaning the few is real; because he has indeed few bitcoins in total) and will not have to many money from those (are few bitcoins). While if don't sell those but save all his few bitcoins in its wallet one day will have from those much more.
All the suppositions are made with the idea that one day the price of bitcoin will go very high. Event this that it is not sure.