Decryptors are another optional extra Atlantica Gold for invention and while module and ship invention can be successful without them, there is a key difference between those that are used for rig inventions.
Since Tech II rig components are usually very expensive, the mineral efficiency of the output BPC is a key factor in the sale value or its usefulness when manufacturing them yourself.
It is recommended that the decryptor which increases mineral efficiency be used in every rig invention attempt as a higher mineral efficiency will significantly reduce the cost of construction, in some cases by over 100 to 200 million ISK at market prices compared to using other descriptors.
REGIONAL VARIATION - Although all wrecks have a chance to yield components, it is definitely worth noting that there is a factional variation to the type of components dropped. Some components only tend to drop from certain factions of ships.
While invented copies tend to have negative Mineral Efficiency, those found in exploration sites are always two-run, with zero mineral and production efficiency.
This gives BPCs found through exploration a significant increase in value per run as the build costs will always be lower than invented blueprints.