GERTY's existence destroys the plausibility
So they can create something that can cut hair and perform very complex tasks, including health care, psychology and conversations.
But they can't create an AUTOMATED process for extracting the stuff from moon?
If you think about it, the whole movie becomes silly. A corporation with tech level high enough to create a GERTY, would certainly be able to automate the whole extraction process. Heck, it's already halfway (or further) there! The big extraction machines work automatically.
What is Sam really needed for? Which is cheaper, easier and more streamlined;
1) Develop automated machines to handle the -whole- extraction process, and basically do Sam's work. Surely GERTY-level tech could do everything that Sam is there for. His work doesn't seem that complicated. He basically takes a tube, brings it from place A to place B, then loads it into a pod/ship and punches a code to launch it. Why wouldn't a robot / automated base be able to do it? Combine GERTY with the already automated extraction machine and you have the solution.
*SIDENOTE* (any CODE to be punched in to launch the ship/pod/whatever that transports the minerals to Earth - if there's only ONE worker in the whole base (or the whole moon), why would there be a need for a code?)
*SPOILERS* (But it's your own fault for reading this anyway)
2) Create an enormous amount of clones that require certain temperature to stay alive, nourishment, all kinds of 'fakery', lights, oxygen, clothes, hobbies, sleep, communication, laundry, utensils, furniture, etc. etc. etc. that robots or an automated base wouldn't need. Then do this whole VERY complicated 'wake-a-clone-every-3-years'-routine to keep it all going.
Plus all the supposed 'ethical issues' (entity without a soul does not require any ethical thought, because only soul can feel pain, misery, suffering, joy, etc. - without a soul, a body doesn't feel anything. There would only be issues, if there's incarnation every time you 'wake up' a clone, but then every clone would be an individual, instead of 'Sam's personality'.
Just how much money goes to sheer maintenance, must be mind-boggling, compared to how streamlined the process could be if everything possible would be automated (I can't see a reason why Sam's job couldn't be easily replaced by automation).
Out of these two options, as a corporation that has GERTY-level tech, plus automated extraction machines, which option would you pick?