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So, in 40 years the Spanish/Portuguese were getting a return back on their initial capital expenditures for exploration? Well…that is kind of a long time to speculate, yes. Paid off for them though (in the short term…kind of fucked them over in the long because they didn’t understand the difference between money and wealth, but hey…these were Spaniards so what can you expect?), right?
I’m guessing that if the US put real resources (say, what it cost us for our stupid invasion of Iraq) into developing a real exploration and exploitation of space program we could probably get some kind of return on our investment in, oh, say 40 years as a nice round number. Hell…we HAVE gotten a fairly nice return on our investment in space just in our communications satellites and such (though the nay sayers of the time felt space was entirely a waste).
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Communications satellites were not some happy accident. People realized their potential decades before they were technologically feasable.
The thing with the Spanish and the Portugeuse … they weren’t just exploring blindly. It wasn’t a case of “let’s just wander around the globe and maybe eventually we’ll make some money off it”. The target was the Spice Islands and they were fairly confident starting out that they could turn a profit if they could find the right route. So much of the early exploration was very targeted. And when Vasco de Gama finally made it there and back he turned a profit on his very first voyage. They knew their business model, took a gamble, and it paid off.
Space colonies have no business model. There’s no compelling reason to build one other than it would be cool and vague ideas about Manifest Destiny. That’s not enough.