The most important reason why reusable launch vehicles have typically been more expensive than expendable ones is that - producing reusable rockets requires more effort. recovering reusable engines after launch is costly and reusable engines are made of more expensive components.
Reusable launch vehicles (RLVs) are those that can either contain vehicle stages that can be recovered by a launch operator for use in the operation of a launch vehicle that is substantially similar in the future or that are designed to return to Earth substantially intact and can therefore be launched more than once.
A launch system that can only be used once before its components are either destroyed upon reentry or sent into space is known as an expendable launch system. ELVs normally consist of a number of rocket stages that are fired one after the other until their fuel runs out and the vehicle reaches its desired height and speed.
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