Jesus! What kind of coverage do you guys carry? I ensure a motor swapped 2005 Honda Ruckus, and my 2010 M696 for $140 a year combined. That covers fire and theft, no PIP since I have good health covereage. I can't imagine what is costing so much? I have geico btw.
Some people choose to insure their property against damage as well as fire/theft. They might also choose to have significantly higher coverage limits because they have more to lose then you might.
Regardless, any and all insurance threads are fairly worthless as has already been said. Limits, coverages, towing, no towing, your zip code, your credit history, your age, your driving record, your vehicle(s), if you own a home or not, how long you have been with the same insurance company, etc, etc, etc...all factor into the price.