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).
Why do you need big quantities? If you have 10-20 selling one or two inst a big deal. I wouldn't mind selling a couple if it skyrocketed but it depends how much by but I would still rather keep most of them.