I've always gone on the assumption that the Nanotrasen employee health benefits are fukken great.
Prosthetic limbs, cloning, organ transplant, hell, even dental.
Not to mention that the super healing medicines and ultra fast cloning pods on the station are completely free to the crew.
I sorta think of it as the reason that employees can turn a blind eye to certain, "unethical" practices.
Also, why would the Sol Alliance provide universal healthcare? What are they, space communists?