I believe the realistic benefits are the reduction in costs. Before SpaceX I believe it cost something like $50,000 per LB to pit an object in to space. Once this starship is fully functional the projections drop that price to somthing like $300 per LB. I'd imagine at that price it would become profitable to mine gold on local asteroids, meteors, comets, etc.
TLDR
Starship = Gold inflation
