Earlier quoted context omitted.
More likely to lead to increased competition between nations/corporations (see the dash for colonization in 19c, leading up to WW1).
Possibly. My reasoning is that, unlike colonization, these projects are so big as to be impossible by one nation. They can only be attempted through co-operation by many.
That's cheap! Any modern developed country could send a crew to Mars in 10 years. However, nobody has done it because nobody has devoted the resources to that cause.
The bank bailouts were around $700 billion, for comparison.
Space travel is cheap compared to the rest of what we do.