He'd only get depressed if he actually believed in those ideas, as opposed to just using them for image-building purposes. For the inter-city rocket flight one in particular, it's hard to believe he could seriously think that's practical, and certainly if he ran the idea past any experts at his companies they'd be able to tell him why it's not.
If you look at how he uses Twitter and other public ways to pump up stock prices, it seems likely that he figured out early on that there's lots of money in convincing people that the future is just around the corner and that you should buy shares in his companies to get in on the action.
He's the wealthiest-on-paper person in the world not because of the value produced by his companies, but because of the future value he's convinced people that his companies have.
If you look at how he uses Twitter and other public ways to pump up stock prices, it seems likely that he figured out early on that there's lots of money in convincing people that the future is just around the corner and that you should buy shares in his companies to get in on the action.
He's the wealthiest-on-paper person in the world not because of the value produced by his companies, but because of the future value he's convinced people that his companies have.