Why would they try to bring the resources down to earth? It is so expensive to send things out of our orbit they should be selling the material to future floating stations, like the ISS. Also, satellite manufacturers and space probes could be constructed in something like the ISS with the majority of their heavy parts being made from asteroids.

Hmmmm. I don't know much about material science, but maybe they are mining silicon and fabricating solar panels? What is the heaviest part of a probe or satellite?