Henry Spencer wrote:

The fundamental cost of
putting mass into orbit with LOX/kerosene is under $1.50/kg.

Wait a minute; leaving the LOX out of the equation, I can accelerate 1
kg of mass to 18,000 mph and 100 miles altitude with the energy in
around 2/3rds of a gallon of Kerosene? It's running around $2.75 at the
moment.
Price of LOX in 2001 was about $.67 per gallon.

Pat