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If you are capable of mastering a subject through a college text, why would you need to repeat the subject under the auspices of the AP umbrella?
Students taking a course utilizing a college text prior to taking the related AP may be a way for schools to increase performance on AP exams, a boost to high school ratings under some ranking methodologies.
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Furthermore, it seems fairly common for Freshmen and Sophomores to have some AP courses.
Students taking AP courses as high school Freshmen and Sophomores may be a way to increase access to AP courses for those with the ability/readiness to take these courses prior to Junior or Senior year.