That is not the reason that Japanese people don't buy many American products.
The reason is that there are hardly any products made in America.
The reason is that there are hardly any products made in America.
I realise that my experience is limited to the handful of times I've tried to buy stuff from the US. Perhaps I've just been very unlucky, but frankly, the odds are against it.
Pretty much everything I buy, apart from computer tech, is from an American company.