True, and that's exactly the reason why people want to buy this stock now.

If future returns were already (almost) certain, they would have been priced in and you couldn't make any money with this stock.

This is a classic high risk / high reward stock. IF the space economy takes off you might 10X your investment. If it doesn't, you might lose most of it.

Rich people (who own most of the stock market) can afford to make such high risk bets, because they can afford to lose the money and thus many will make that bet.