I'll never forget a coworker telling me that in a previous job hunting round he had interviewed with a pharmaceutical group that was tracking the manufacturing process for batches of drugs and comparing the little tolerance mistakes (heated a little too high or held at temp a little too long or not quite long enough) and finding a market where they can sell that batch.
You'd like to think that companies have factories with quality control laws and there are local people trying to ensure that all of their product are up to the local standards. What you don't expect is that they are binning them like Intel CPUs, where they just make a batch and hope for the best, take cream off the top until the priority orders are done and then everyone else gets whatever is left. You might get a slightly better product sometimes but not be so lucky the next time.