There are some quality responses here; but a point the other posts dont emphasise is the very narrow specialist nature of the technology.
While there is some overlap with military applications – which have tens of trillions of dollars thrown into them over the last five decades.
Arguably up until recently, **manned space flight is not actually a well funded mainstream industry.** It has a (proportionally) tiny budget, for what is effectively a continued series of research experiments (the launches included).
If major world economies *chose* to throw more time, money, and effort at the technology – you would rapidly see a significant reduction in cost, and an increase in reliability (all the listed problems notwithstanding).
This is what we are finally starting to see with the privatisation of space flight.
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