This rule applies to all games added to the main site. The ISO Cellar does not require it.
The reason it applies to the main site is that most users would be unable to play the expansion without the main game, and we'd end up fighting a constant war against warez download links being posted in the game's thread. Not a fun thing at all.
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"God. Can't you people see I'm trying to commit a crime against science and nature here?"
-- Reed Richards
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