Yes, ge t the insurance. Can you afford to lose all your money if you have to cancel for whatever reason? Can you afford the tens of thousands of dollars if a medical emergency happens and you have to be evacuated from the ship? Can you afford to pay for medical care in a foreign country if someone in your group trips and breaks a leg or something similar.....and you miss the ship? I can't which is why I buy travel insurance.
Check out the following link: http://www.insuremytrip.com