Is it true that it's way more expensive to insure a convertible? I was thinking about getting one and I wanted to see if the rumor is true...

http://www.iihs.org/vehicle_ratings/ictl/ictl.htm

This non profit group determines the cost to insurance company based on break down of type of vehicle.. you might be able to extrapolate information from there... I have no personal experience owning or insuring a convertible..