I think you find that for third party claims that is true but if you want to
claim for something that isn't part of a car's specification like $2000 wheels
when they think it only had $500 you might be short changed slightly.

It doesn't matter where you are any Insurance is a private contract between you
and the person (company) covering your actions. If you happen to be banned or
suspended from driving you are also uninsured.

Ah!  So trusting.  Your insurance is a legal contract between you and the
insurance company and the risk you are to them is dependent on the information
you supply.  Supply lies or incorrect info and not contract

How do they know - YOU TELL THEM.

Now you are thinking Tosser (jerk)

However, If you have lied then the contract is null and void or in simple terms
NOT VALID and you are thus UN-INSURED because the risk factor for theft is now
different to what it would be with stock wheels that only cost - say - $500 so
if they want to, and I doubt if they would, only pay for stock wheels and not
$2000 for Bling Bling wheels.

If the car was in a fatal crash they could and probably would refuse to pay out
as they would say that the car NEVER came with those wheels and they never knew
about them and were not tested for use with that car.

Same with engine mods.  You insure a 318i with auto trans but later stuff in a
small block 400CID Chevy with 400bhp but do nothing to anything else.   One
thing it won't do is go around corners or even stop with stock piddly brakes.
And then not tell me the risk has changed - no insurance.

Insurance company's risks are much greater than a stock 318i especially if some
17 year old is trying to control it.

Gambling is much the same - who always wins at the tables?  The banker or Casino
owner.  Why?  The odds are in his favour.  If you kept winning the risk of him
losing is greater so they ban you from gambling at their Casino.

Risk factor.  Tell you what.  I will cover you life for $1,000,000 providing you
don't commit suicide or indulge in dangerous sports such as Drag racing, hang
gliding, Motor racing, Snowboarding or simila.  Also you must not ride a bicycle
in New York without a crash helmet.  If you were riding a bike in New York and
fell off and land on your head without a crash helmet I would say that that is
not part of the risk I am coveringt and I would not pay out.  I think the risks
involved are a little too much for you to even think about it.