You wont get your buy price back and it's by design. Otherwise everyone would make a profit bringing them to any station in the galaxy. As mentioned previously, the sale at the settlement is a temporary measure until the barnacles that spawn them are fixed. But from what I heard the destroyed state is by design, and so is the heavily defended barnacle. The bug is that intact ones don't drop the meta-alloys right now.
Yeah I don't mind at all, as I said it was me just making an assumption that they were working like the "rare goods" so my inherent trader's greed made me fill up with a load of 100+KCr goods thinking that the trip back to civilization would earn a meaty profit.
I really have gone at my two "engineer" experiences very half-(donkey)ed and not checked things out before wasting time and resources.
So yeah, I do understand why they have done it the way they have, I have no complaints, I just made the thread to save anyone else making the same mistake really.