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Fast lenses mean big money. Large max aperture lenses have to be engineered designed and polished to extremely fine tolerances to be any use at all wide open, particularly so with the increased distortion inherent in wide lenses, and as it is, they usually benefit from being stopped down a little.
I would guess also that most of the pressure on manufacturers is to produce fast tele lenses for the pro sports, reportage market where most of their sales must come from.
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