Re: I was thinking...
Yeah, Paypal was a real crackpot idea and Tesla is encouraging more mainstream manufacturers to get in on the electric car market, which in the the States at minimum is going to make the crackpot Tesla battery factory a fair amount of crackpot money.
Additionally almost nobody makes car sized Li batteries in the the US and certainly not to the scale necessary if electric cars were to be in the majority.
Even SpaceX makes money from the contracts it has with NASA, although I think it gets spent pretty fast developing recoverable sections and better capsules.
As for the crazy Hyperloop, we had one in London in 1864 and it worked as well as beig the 2nd oldest underground railway in the world.
I'm sure some improvement could be made.