> Why would a flood of cheap bicycles affect the business of higher-end bikes, when their customers were oh so knowledgeable?
One possible scenario: suppose retail display space for bikes could not expand proportionally to fad-driven demand, and stores started featuring cheap bikes more prominently in that limited space to meet the changing customer demographics. As a result, high-quality, expensive bikes would have a smaller total number of eyeballs looking at them, bringing about an absolute decrease in sales (not just in market share).
One possible scenario: suppose retail display space for bikes could not expand proportionally to fad-driven demand, and stores started featuring cheap bikes more prominently in that limited space to meet the changing customer demographics. As a result, high-quality, expensive bikes would have a smaller total number of eyeballs looking at them, bringing about an absolute decrease in sales (not just in market share).