That's the thing, you can only have that kind of number for so many years before you start really not wanting it to get down.
And chances are they have been buying quite a bit of lifestyle by borrowing against that number. Because selling would strip them of that voting control you pointed out. Then they can't really afford the number to go down, because the borrowing is effectively a cascade, so in reality they aren't anywhere close to free in their decisions.
(but I'd imagine that they are quite capable of deluding themselves into believing that the decisions they have to take to keep the number up are what they actually want)