Or most likely in today's scenario, demand is miniscule in space compared to earth's so you sell on the earth market while demand in space materializes.
If you make water cheap in the orbit, and have capability to produce fuel... it would drive investments into space through the roof.
Suddenly you only need to get to orbit, as everything else is cheap, because you can refuel and get water. You can go where you want to go, you can grow food, you can stay in low earth orbit for cheap.
