Because mathematics is logical and clear cut, it's how you choose to apportion that data is where the potential flaw is. Now if it is a flaw then fair enough but I don't accept the blanket statistic argument because it hides what is truly happening. Being an engineer I like to try and understand the underlying mechanisms, my wife obviously thinks its because I'm a nerd
OK I'm going to try again, I apologise in advance for the long post... Firstly - what credibility do I have to explain this? Not a huge amount, but my now retired father was a senior director at one of the largest financial institutions in the UK and I've discussed this with him before. Also, to me a lot of it seems like common sense, hence the exasperation when people don't seem to get it.
Firstly, the "blanket statistic" you refer to isn't blanket at all. Accident details are shared between insurance companies so different types of third party claims will have a different impact on your premium. It may not be "enough" detail in some people's opinion, but accuracy has to be balanced with efficiency or premiums would increase anyway.
There tend to be 2 arguments about it around here which go around in circles.
1 - It's not fair.
Well that depends on your definition of fair. When this is proclaimed around here, my response is often - how would you do it to make it more fair? This has never been responded to.
Using the numbers to analyse risk is really the fairest way. You could have someone manually looking at a person's claim history and applying opinion to it, but 2 problems with that. Firstly, it would add a significant cost, which would no doubt be reflected in everyone else's premiums. That's not terribly fair to those who haven't claimed! Secondly, it wouldn't be consistent - as soon as you start applying manual intervention or opinion to anything you introduce human error and inconsistency, that's definitely not fair.
Yes, it sucks - I'd never say that someone like the OP "deserves" the increased premiums but that's life. There's a lot in life which isn't fair, unfortunately being fair to everyone is nigh on impossible, especially when "everyone" constitutes a significant portion of the UK population!
You also don't hear people complain when their premiums go
down because of statistical factors which don't make sense. OP parks his car on a drive, that may have worked out cheaper than parking in a garage - which to some would logically be a safer place to park. Ultimately with analysing risk for insurance, there doesn't have to be a causation, just a strong correlation. The only exception to this is, recently - gender. There's a huge correlation (and causation!) between gender and risk, but politics got in the way with that one.
Tl;Dr - Life isnt fair, get over it
2 - The companies aren't using proper statistics. It's all a big conspiracy, stick it to the man, rabble rabble rabble!
The actual processes used to calculate risk and subsequently costs are pretty closely guarded and I don't think there's much information in the public domain at all about it. The details would also well beyond my level of understanding, but what I can be sure of is that they do use every bit of information they can to more accurately assess risk.
Some just say they will unfairly load your premiums when you have a third party claim - this is absolutely untrue and might even be illegal. How can I be so sure that this is the case? Well, knowing someone who worked with these things gives me a good amount of confidence for a start.
Also, as you say, there are cases when premiums WONT go up after a third party claim - the only way to explain this is that whatever calculation of risk the insurance company has carried out has shown that individual to be a lower risk. Either that or more likely, other factors lowered the risk and the third party claim had little effect.
Finally, it's common sense - as I said earlier, it's in everyone's interest to use the most accurate information . The insurance companies make money by being accurate - if someone is a risk they need to know so they can apply a high premium to pay for the claims. If someone is a lower risk, for whatever reason, then they need to be able to apply a low premium. This is the bit that some people miss, that insurance is still a competitive market. If you can't be competitive in a market where price is most people's main/only factor when buying then you'll lose business.
If all the insurance companies were loading premiums unfairly for a certain group of people who DIDN'T constitute a higher risk, then it wouldn't be long before someone set up a company who offered that group of people a lower price and made a lot of money themselves.
Tl;Dr - Yes, they are.
I have really no desire to spend my sunday lunch with my dad discussing insurance, but if you have any specific questions I can certainly ask the question when I see him later. But hopefully the above explains it, although I'm full expecting
someone to come back with "But it's not fair!!".....at which point I'll probably find the closest brick wall.