[TeMPOraL]

The cost is literally the entire point of reusability, though. In case of Space Shuttle, the reusability of orbiter module achieved very little - between inspections and fixups of the orbiter, rebuilding SSME, building new external tanks, and expensive refurbs of the SRBs (where it was arguably cheaper to build new ones - a dip in salt water is very bad for rockets), the whole program was so expensive that the US would've been better off launching people in throwaway return capsules on regular rockets.

Meanwhile, SpaceX is actually landing the rocket in upright position. No salt water dip. The whole rocket is so cheap and procedure is so normalized that by this point, most people have lost count as to how many flights a given F9 first stage already had. I think they've already flown at least one booster 6 times. This is how true reusability looks like - saving money, increasing cadence, and well on its way towards the ultimate goal: being able to land a rocket, refuel it, and launch it again, all within couple hours at most.

[cma]

Cost is not the entire point of reusability, especially the first to substantially pull it off (Space Shuttle). Demonstrating and developing the technology is part of it too. Starship for example will use ceramic tiles, not identical with, but still proved out by Space Shuttle, which used them first.

You are also comparing amortized program cost of space shuttle and not final marginal cost (around $450million per launch at 7 astronaut capacity and higher payload capacity).