The program at your school was designed to provide you with access to your course materials on or before the first day of classes, and at the lowest price. On average, 98% of students whose course materials are offered in these programs choose to stay opted in. Opting out will mean you lose access to course materials, such as the ebook and some digital assignments, and purchasing those materials on your own may cost more and take additional time to gain access.
Here's a video from VitalSource that details the student Opt-In and Opt-Out process:
