Really? I've never seen any calculation of sales, let alone LucasArts' internal projections. Share!
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Just plain old deductive reasoning. The first game broke sales records, made history for RPGs, had girls jumping out of cakes, interdimensional beings dropping by for photo-opportunities ...
The second would have been pitched as "like the first, only bigger and better, for less money (because the engine is already built)", and it didn't achieve the same sales and probably cost more to develop than they planned, which equates to less Return on Investment, which means suits are not interested in spending good money after bad. Phrases like "pouring money down the drain" and "cut the losses" are bound to be being bandied about. ...