apple has positioned itself to a certain type of customer, wealthy people, innovators, people with good jobs, good lifestyle, etc. If Apple targets the poor man type, the trendy guys will stop buying Apples, because everybody can and Apple is not the Porsche of the computers anymore,
this would hurt more the brand than maybe the increasing sales because of lower prices, and in good times, where everybody has more money, Apple would have the problem that they cannot rise prices, because everybody expects a cheap Apple (the macroeconomics deflation problem).