Lots of billionaires are. They just tend to keep to themselves.

Also, Bezos has Blue Origin.

Which one are landing orbital class rockets again?

FYI, Blue Origin has been at it longer that spaceX has existed. But SpaceX, spending at least 5X less money is landing orbital class rockets and whilst Blue Origin is doing suborbital flights.

>SpaceX, spending at least 5X less money

not to argue, but both Blue Origin and SpaceX are private and don't disclose ther financial information, to my best knowledge. So where is this number coming from?

For Blue Origin, they don't have any customers yet, so no income there. And it is public that Bezos just sold what, about a gigadollars worth of Amazon stock, presumably to dump into Blue Origin (which I think he's done about once a year?).

> For Blue Origin, they don't have any customers yet, so no income there.

You couldn't be more wrong. They've had payload customers for their test flights. They also have 4 large customers signed up for their New Glenn rocket (in development).

There was a study comparing NASA's development costs to SpaceX's, which SpaceX has commented on.

BO has never reached orbit, and doesn't say much about how much they've spent, so no one knows what their costs will be.

> Which one are landing orbital class rockets again?

Blue Origin is also developing VTVL rockets.

BO is expecting to have passenger flights by the end of 2018.

I think more precisely, plenty of billionaires put money into these things, but it’s too often to little effect due to lack of direction/clarity in the organizations the money is being poured into, too little money being put in, or both. What makes Musk (and Bezos) different is the laser focus and zero hesitation to commit huge amounts of cash to said goal. Where others would be happy to say, “oh well, maybe tomorrow” Musk is always asking, “why didn’t this happen today?” and acting on the answer for better outcomes in the future.