In fact, most cadets in Air Force ROTC are not on scholarship. The time commitment to ROTC is overwhelming. Actually, the minimum time commitment is only a few hours a week for freshmen and sophomores, then increases slightly for juniors and seniors who have a more active leadership responsibility within the corps. This is not true. View the minimum requirements to become a pilot.
Scholarships are available for many different majors.
The starting salary for an an Air Force Officer is very competitive with other occupations. Compare salaries of some other occupations.