Also, while 150t is the target payload capacity, the current test vehicles are closer to 50t in payload capacity, there are revisions in the pipeline based on data from these test flights which will bring it up to 150t.
The dumping of this excess propellant actually caused an explosion and loss of vehicle on the second test flight.
Whatever that means is what it means, the ship was out of control and I don't know whether or not the mission requiring that payload was successful, but the fact is that it did carry the payload.
A modern airliner on a long flight might burn around 80 tons of kerosene. It's slightly cheaper than methane. Call it 75-80K$.
Am I mistaken, or are there distance/payload combinations for which Starship is cheaper per pound on a point-to-point basis than air transport, even setting aside 30 minutes versus 12 hours? Isn't that the non-intuitive outcome of ballistic trajectories?
It's quite possible that SpaceX has access to some cheaper methane source. Texas produces a lot of it.
And SpaceX has speculated about eventually switching to some renewable source by e.g. synthesizing methane. In which case that would boil down to cost of electricity and carbon. I don't see that becoming cheaper short term but that could happen long term.
No idea about the other costs.