The actual answer was hinted above, but here is the explanation courtesy of the folks at Def Leppard
Quote:
For economic reasons, it is common to add one or more bonus tracks to Japanese releases, in order to avoid Japanese retailers trying to sell the import releases. Retailers can get import releases for a lower price, so they can make more money if they actually sell these for the regular sales price. Fans are more interested in the Japanese releases, which have more tracks, so they will not be more interested in the imports. If the import releases would sell more than the Japanese releases, it could cause a catastrophe for the Japanese economy. Most bands use this strategy in Japan.
The European/UK release of "X" did get two extra tracks for different reason: to 'make up' for the fact that the band plays in North America way more than in Europe.
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