I have been involved in two 'bumps' in all my years of driving, one fatal.
Neither were my fault, in the non fatal one the other driver was prosecuted for dangerous driving.
So, even though I have been driving over 30 years, choose to drive a car that is neither a thief magnet nor antoganistic to other drivers looking for somebody to race, keep my car locked in my garage you think I should pay more?
A car parked outside a house on a busy road is more likely to get bumped. An inexperienced driver is more likely to have an accident.
Certain cars are more likely to be stolen than others.
Somebody who drives 50k miles a year is more likely to have a bump than somebody who drives 5k.
I may be biased as I pay under £200 per year fully comp with the all the add ons, but I think it works just fine as it is.