I think, Japanese SuperGT is different due to different japanese attitudes. I believe, that these manufacturers can't refuse to be in SuperGT, even if it doesn't help with sales figures.
Its kind of "loosing face"...
Sure, NGTC is at first more expensive than WTCR, but maybe more interesting due to "building their own car" and have more possibilties to improve it.
Maybe many brands in WTCR sell the car cheaper than it is and try to earn the missing money by selling spare parts...
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