You are taking the piss yes?
They're selling a service (a launch) not a product (a rocket).
Therefore it is very much in their interest to keep costs low and to make things durable. These things will have planned obsolescence indeed, but in the order of tens of launches. You can plan for and around that.
SSMEs were lifed at something like 50 launches (I forget the number of minutes of use).
Biting the hand that feeds IT
