[Hypiereon]

In house text-books can be more focused and cheaper. Yes, it's reinventing the wheel, but at the same time some of the adult classes do not need pretty pictures. As well, some in-house text books can be specific to a certain profession, and not really all that available except in fragmented form in several other text books.

I can see the good and bad in both. Cheaper price generally means cheaper quality (in China almost synonymous with pirated) but also can be more focused. In a larger class with younger students, a more established system would be better. The short of it is, I don't think there is a blanket big enough or well-rounded enough to cover that bed.