* Accreditation: Accredited programs undergo rigorous review to ensure quality and standards. This process involves significant costs for the institution. Unaccredited programs may not be accepted by colleges or employers.
* Instruction and Support: Qualified instructors, curriculum development, grading, and student support (tutoring, advising) all require staffing and resources that aren't free.
* Assessment and Testing: Reliable and valid assessments to demonstrate mastery of material are crucial for a legitimate diploma. Proctoring exams, developing tests, and ensuring academic integrity also add expense.
* Record-Keeping and Administration: Maintaining student records, issuing diplomas, and managing the program administratively costs money.
While some organizations offer free *components* of a high school education, like individual courses or preparatory materials, a complete, accredited program needs to cover all the required subjects and meet accreditation standards, which makes it financially unsustainable to offer completely free. Many programs offer financial aid or payment plans to make them more accessible, but truly free, accredited options are extremely rare.