Re: ZBLAN is reckoned to be the a product that could be made at profit in space
"But don't expect SX prices to NASA to fall just because it's a "re-flown" booster and capsule."
Mainly because SpaceX (and Orbital Sciences) are on a fixed price contract, (unlike the 'cost plus' contracts of old that Boeing and Lockheed Martin got fat on.)
If SpaceX can reduce their costs whilst still delivering the cargo they're contracted for, then they can make more profit. If their costs are higher than the price they're contracted at then that's thier problem, NASA doesn't have to pay out any more money.