I think you are putting too much importance on foreign sales. For one thing foreign monies are very heavily taxed if they are transferred to the US. If the studios are international, then it makes sense to keep that money where it is at rather than to bring it to the states to fund US projects.
International business is complicated and should not be considered on a dollar per dollar basis with US receipts. It makes good business sense NOT to bring that revenue to the United States.
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