Why are cash advances a bad idea?

Related questions

1. Can I pay off a cash advance portion of a credit card?
2. How does a cash advance work?
3. Can I get a cash advance on my prepaid debit card?
4. What is a cash advance loan?
5. Can you overdraft at an ATM?
6. Can you cash advance at ATM?
7. Is paying bills with credit card a cash advance?
8. Do cash advance places run your credit?
9. Is Bpay a cash advance?
10. Can you withdraw money from ATM with overdraft protection?

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