The most they normally do is just slap a different name on the product. That's why you hear of getting no name brand TVs from a factory that spits out the name brand tvs but after they fulfill their name brand contract, they slap a different name on the no name ones that come off the same production line. Basically it costs more to make changes to a production line, now you're sourcing different types of materials. Lots of evidence for this. No evidence for your batch production theory. Just an excuse to justify a higher price.