Do High Schools even print/sell yearbooks (we called them 'Annuals' in my day)?? I haven't seen a current one in ages... maybe I should ask my grandchildren?
I DO remember spending much time in HS soliciting 'paid ads' for the school newspaper and Annual/yearbooks.
I went to a smaller (110 in my grad class) county school, and they were exceptionally poor in those days... we had to solicit funds via contributions and ad sales for nearly everything extra-curricular that we did in those days! And we solicited essentially all commercial businesses, not just car dealers; including restaurants, clothing stores, you name it...
PS. In my first paid job (between HS and college), I started at $25/week for a 48 hr/week job, and the only year I was able to buy an annual was for my senior year.