Welcome to the future, folks.
There is more mineral wealth just floating around our solar system than a million times the amount Earth EVER contained. As these asteroids are mined, tunnels will be built, forming the basis for a space station and/or colony. This fact more than doubling the usefulness of the entire operation, AND it’s return on investment. I think THIS is going to be the way in which we’ll begin to colonize our Solar System. Also, a lot of the hazardous (to the environment, human beings, and/or both) that are an inevitable byproduct of heavy industry on our planet could be exported to stations like these, tripling the value of the entire operation.
Today, the Luxembourg Government announced that they are taking steps to become Europe’s hub for mining space resources.