Why is Toefl so expensive?

Related questions

1. Why Toefl is not accepted in UK?
2. Is 112 a good Toefl score?
3. Which is better Toeic or Toefl?
4. Is one month enough for Toefl preparation?
5. Do I need Toefl if I have sat?
6. How does Toefl exam look like?
7. How long should I prepare for Toefl?
8. Is Toefl difficult?
9. Is Sat harder than Toefl?
10. Is 79 a good Toefl score?

Tags

1. #students
2. #there
3. #research
4. #experience
5. #development
6. #service
7. #system
8. #supported
9. #questions
10. #behind
11. #registration
12. #toefl
13. #whole
14. #expensive
15. #especially
16. #taking
17. #paying
18. #first