It literally wasn't. He paid way more than what the stock was worth. (Hence why he desperately tried to get out of it, and why the board desperately tried to make sure he had to go through with it.)
He's said before that he hates it, but including one of those thumbnails boosts viewership by 30%. I certainly don't like it, but it would be really hard for me to resist that extra income too.
It literally wasn't. He paid way more than what the stock was worth. (Hence why he desperately tried to get out of it, and why the board desperately tried to make sure he had to go through with it.)