It doesn't make sense, until it does - because Mark's shares are quite literally a separate class from all other shares and IIRC have 10x the voting power as common class A stock.
If he announced he is selling them all at once, I have no doubt in my mind he could get someone (or a group of investors, or a bank) to purchase all those class B shares almost immediately at a VERY healthy premium. Meta shares are currently around USD $715. There's absolutely zero doubt in my mind that if he was to sell them in a block, with the outsized voting power, he could command roughly USD $950-1100 per share with ease.
If he announced he is selling them all at once, I have no doubt in my mind he could get someone (or a group of investors, or a bank) to purchase all those class B shares almost immediately at a VERY healthy premium. Meta shares are currently around USD $715. There's absolutely zero doubt in my mind that if he was to sell them in a block, with the outsized voting power, he could command roughly USD $950-1100 per share with ease.