It's amusing that you posit the notion that instead of launching the rocket (its entire purpose to exist), they might disassemble it for scrap to save some cash.
SpaceX has built and scrapped 17 Starships, 14 of them without even a static fire. They have scrapped four Super Heavy boosters, three of them without firing.
Test flights require fuel, planning, approval, and of course flight hardware. None of that is free.