S 18's HS offering college credit for HS classes: worth it?

S2’s HS does “College in the Classroom.” We would not have paid for college level Algebra or Trig as all our kids have majors that require college Calculus as part of the major. We did pay for the ones that will be college credits but not within the major, figuring that major courses rely on knowledge from the college’s prior coursework. We paid for Sustainable Design, Ethics, Comp Sci 101, Anatomy, a couple others. S2 will have between 10 and 40 credits depending on which college he chooses. We consider it a low-cost gamble that pays 10:1 if he ends up with the credits.