X.O.
If it costs a single penny, decline it.
I got invitations to "Who's Who in American High School Students" when I was in high school, but thought it was ridiculous to pay a fee to be honored. My suspicions were right when the book came out and I saw it in the guidance counselor's office. Several mediocre (at best) students in my class were on in the book. Guess they paid the fee.