Just a small correction, under the "Conclusion" section, JET is listed as a "other large company" along with Berlitz, ECC, and the rest.

JET is a government program run in partnership with a private organization and local administrative bodies (like most setups in the Japanese government) and the wages are paid from taxes, like any other public servant. JET is not a profit oriented organization like NOVA etc.

Not a big point, but it might save some Google users a bit of confusion.

Otherwise, great article Brooker