Space tourism, cheap comms, sell the platforms to the military, space solar, be the first to get your DNA all over a new planet.
Although if it's true that it's cheaper to get the resources on earth than to bring them down from space then it does put a big hole in their current business plan.
Its more efficient to use them up there in space, than to drop them into a hole (down the gravity well).
Think of it: the entire space-based mining industry needs equipment, parts, rockets, everything. Why make them down on earth? Make them in orbit, or better yet right there at the mine site.
The first decade of mine production would sensibly go toward more mining infrastructure. That's the most expensive equipment on earth - why send platinum down the gravity well to be made into pop cans, when you can sell it back to the mining concerns for making more mining equipment.
Then you start to question the whole point. Other than moving imaginary numbers (dollars) from one column to another, what's the point.
Although if it's true that it's cheaper to get the resources on earth than to bring them down from space then it does put a big hole in their current business plan.