When I'm rich, and my reusable orbital launch program is well under way, I will be performing many orbital test-launches and paid satellite deployments. Once I've knocked out the bugs and optimized my processes, I will build the confidence to start manned launches and be able to take over the galaxy etc etc.
I believe I will be sending up lots of dummy payloads, and I suspect that most launches will have spare capacity, particularly while my clients reposition themselves into a world where launch capacity is more plentiful. And my choice of dummy or filler payload will be .... big blocks of plastic-film coated water ice!
I am imagining a collection of 1m^3 cubes, or of the order of one-ton units, coated with reflective plastic sheet to prevent sublimation, deployed to a reasonably accessible orbit, high enough to be stable. And I'll develop a small ion-thruster tug-boat that can efficiently fetch and haul them to a location chosen by the highest bidder - the ISS, or anywhere my tugs will reach. They don't have to be cubes; they can be whatever shape fits.
Any plan involving significant number of people in space will need water, and although one day we may mine it directly from planets and comets, for the foreseeable future the water in space will be hauled up from Earth. And that space hotel is gonna want a low-g swimming pool!
I'm figuring the marginal cost of additional payload to orbit is the lowest launch cost there is, especially when the alternative during tests is to send a block of concrete or play a car stunt, and otherwise is to reduce fuel and cut the costs and stresses. Therefore, I'm going to pack each flight, test or otherwise, with as much water as I can lift. And maybe other non-perishable stuff: steel pipes and aluminium plate and tanks of O2 and ... stuff.
So, is this concept viable? Or are there hidden costs and difficulties? Perhaps the marginal and operational costs now are large compared to the lower future costs which must exist for larger-scale human space presence. Or maybe everyone's been doing it already for so long that nobody even talks about it - that would explain why my Google searches came back empty...