"Magma extractors keep liquid hot magma away from evil Capitalist volcano lairs."
Magma Extractors are the 11th generator in the Ore industry. The ore cost, like Cyborgs, is easier than the placebo cost of Air Rescues. However, both the unlock and the generator cost are huge jumps from previous generators. The unlock is 10.5 T comrades, more than every previous generator combined, while the laser drill cost of 1 EE makes 1 T discount a must in order to do the pre-auto missions at Rank 134 and Rank 135.
After reaching Rank 136 and unlocking Bendin' Bolrog, however, the laser drill cost becomes much easier, so this generator just becomes a large comrade wall. Thus, it is recommended to skip unlocking this generator whenever possible, such as on Rank 137 and Rank 139 which do not have Magma Extractor missions and ore missions only go up to FFFF which can easily be completed with just Laser Drills.