Even being a seemingly simple structure it would still be expensive to build. I'm sure it also contains latching hardware, etc. used to release it. Seeing as

Even being a seemingly simple structure it would still be expensive to build. I'm sure it also contains latching hardware, etc. used to release it. Seeing as it's mostly a static piece if they can get it down in one piece it's probably "trivial" (compared to a full core) to re use it, but it saves money (and junk in the ocean)