Brian Dempsey persists in his folly, in comments.

OK, Brian. You claim that SS1 cost five to ten million dollars per flight. So riddle me this: if Burt had decided to fly SS1 one more time, do you claim that he therefore would have had to come up with five to ten million dollars more to do so?

If so, why?

If not, then how much do you think that he would have had to come up with, and in that case, what was your original point, which was comparing SS1 cost to other suborbital vehicle costs (i.e., apples and kumquats). Wasn’t the intent of your mistaken posting to attempt to wrongly persuade people that SS1 is not a substantially cheaper vehicle to operate?

You may think that the difference between marginal and average costs is meaningless, but people who actual understand launch economics (and economics in general) do not.