Not only fuel! It would be a big boon if bateries (think Edison or lead battery not Li-ion), construction beams, antennas, heat radiators and similar heavy low-

Not only fuel! It would be a big boon if bateries (think Edison or lead battery not Li-ion), construction beams, antennas, heat radiators and similar heavy low-tech items can be manufactured in-space from asteroid ores so they don't need to be launched. With thousands of satellites, there will certainly be big market for such parts. Precious metals will be only a byproduct in the beginning.