I am assuming you are a sophomore.
Please take this with kindness...if you are a sophomore, or heck even a junior, you are making a HUGE assumption that you will get an appointment with regards to why you should take the exam.
1. At this point this should not be about validating any class at any SA, but plan B if you don't get an apptmt. That 100 bucks may mean you will get validated for your college credits, and that means you can take higher level courses from the get go. It also can help in admissions from a competitive status.
2. You have stated that at your school if you do not take the AP exam they will show it as honors and not AP. In this case it will impact you all around from the school profile aspect (USAFA, AFROTC scholarship and college admissions) because to them you did not take the most rigorous course load.
~ IE You decide not to take the AP, but 75% of your classmates do take it. They see you have honors, not AP just because you did not take the test.
I get it if you can't afford to take the test, but if that is the reason why, may I ask if you talked to the GC about financial assistance for that test? Many schools do offer financial assistance.
If you can afford the $100 bucks, than it is worth the cost because if you have to go plan B (AFROTC), colleges like to see those 4 or 5 AP scores when it comes to offering merit packages. 100 bucks now can equate to saving thousands.
~ Look up your college choices and see what they cost for tuition...divide it by their max credits. VT charges @440 per credit hour. That class would be 3 credit hours or 1320 bucks if my math is right.