a mate of mine used to laugh at me when we parked our bikes. i had a big chain, brake lock, alarm and a u-lock thru the back wheel. All of these i knew would only take 5minutes to get around (even the chain around a pole), but it was 5mins most guys would not bother with when there were so many other easy targets about. Anyway, my mates bike got stolen from next to mine. His bike was just a CB400, but it was easy bait.
insurance is expensive when you pay it every year, but it's a welcome expense when you need to fall back on it. As far as i'm concerned, if i didn't insure, the money not spent on premiums would not go into savings, but on some other expense, so when the time came to replace a stolen bike out of "savings" from not insuring, there'd be no savings. in saying that, my current vehilce only has third party, but that's b/c the premium and the excess together are a bee's dick shy of the cost of the vehicle.
I know it's no voice of sympathy (though i am sympathetic at your loss), but i do hope you were insured!