First, you don't have any idea what those numbers actually are.
Second, SpaceX has consistently shown lower development cost then anybody else. Starship is expensive its likely cheaper then New Glenn.
Remember, Ariane 6, a marginal upgrade over Ariane 5 with only a new upper stage engine cost 6 billion $.
And SpaceX is already at much higher launch rates and manufacturing rates for thing like engines. SpaceX is investing into mass production already.
So yes, I suppose that is more inefficient, in a way.