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Overall sales is what matter to a Japanese company. How well a game sells outside their homeland means more money, meaning more relevance to their decisions. Using Japan only sales means nothing. Besides the PS1 and PS2 install base is much larger during those era, of course sales would be higher to begin with.
The install base is what drives a company to make games for a system. It's the major reason why ToG is on the Wii is my main guess.
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