Earlier quoted context omitted.
So you are suggesting He'll pay from his personal coffers? by selling tesla stock? thats not bad at all.
What else to spend money on, than to ... influence Western culture and thought? If you only have a few billion you can buy a sports team, but if you have a few hundred, and still your youthful energy, what else could you do?
Also, I'd argue there are better/efficient ways to influence western thought. you just have to look at some other billionaires like Koch brothers to see how its done, if you have any doubts read the book titled 'dark money' by Jane Meyer.