Why is annual multi trip travel insurance cheaper than single?

Related questions

1. How far in advance do I need to buy travel insurance?
2. Is FWD the same as 2wd?
3. Which is best travel insurance?
4. Can a 17 year old get travel insurance?
5. How much travel insurance is enough?
6. Which is better FWD or 2wd?
7. Can you go abroad if your under 18?
8. Which is the best travel insurance policy?
9. Can I buy travel insurance separately?
10. Can a child travel abroad without parents?

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17. #single