its a mild mod, the insurance company will still pay the third party.
Then come after you for money.
Karma will get you. So, what happens if someone else is coming along fast, rear ends you and writes off your car, what happens then? You won't get payed.
Not fast enough MY ARSE. You hit a Bentley (and there are a few around) for whatever reason, crack a rear light or a head light or crack a bumper, you know how expensive they are?
Giving reasons about why you don't need to be insured because you're careful is simply horse sh!t.