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Where these massive launch costs are coming from? All Starship's Raptor V2 engines COMBINED cost less than refurbishment of ONE RS-25 engine. There are four RS-25 engines on SLS.

In other words you don't have a source other than your confidence that Musk is a liar?

doubters had a major goalpost moving moment the first time spacex landed a falcon 9 booster. then they had another when they landed on a barge. a much smaller one when fairings were recovered. if starship misses the cost by 5x it'll still be cheaper to launch than everything other than a recoverable falcon 9 and will completely dominate all aspects of space launch business (except non-US national security payloads).