I can buy rice at Costco in the US for $25 for 50lbs, which is equivalent to 854 yen for 5KG. A bit less than 1/4 the cost of Japanese grown rice.
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Golden Rice 2 was on the market for about five years in the Philippines before it got banned. If anybody had wanted to grow it or eat it it could have been a different story. I was talking to a genetic engineer a few weeks ago who said that the sensory qualities weren't that great. Nothing would have stopped advocates in the US from planting a few acres and selling bags of it (it's approved and all) but had they done so it would have put the lie to the idea that the developers were being persecuted like Prometheus. I don't think it was anywhere near the threat that its opponents said it was but it was nowhere near the boon that its promoters said it was.