To be honest, $26 billion worth of Bitcoin of Bitcoin is not something to joke about, that's a fortune and if a company such as Microstrategy would keep adding too their reserve instead of selling it means they've pictured the future and saw that you can't write it without including Bitcoin, it's the future and there's better times ahead. Also, never forget that a win for Bitcoin is win for every Bitcoin holders, Cheers.
MicroStrategy has really built great wealth in bitcoin but i still have the feelings that they have a target and when that target is met, they will consider selling some of their bitcoins. Perhaps, as they are making news while buying a lot of bitcoins, when they sell, it will also affect the price of bitcoin.
I don't think it is necessary bothering ourselves about their target because we can never know what their target is and even if we do, such information is not useful in any way or form. Unless you are investing to sell when they start selling theirs, which is not a smart thing to do especially if you are a long term investor. If you are watching recent developments in bitcoin, you will know that we have gotten to the point where one entity can hardly drag the market to a halt. Even if Microstrategy decided to sell their bitcoin, the price will only correct a little and recover again.