Insurance is the new oil.
Once more, in very simple terms:
(a) Premiums for motorcycles are not specific to BMW 1200's any more (or less) than they are specific to an R1 or a wheelbarrow. They are all individual and certainly not that technical.
(b) That one bod who is the the thick end of the upper 40's or low 50's of age with no points and no claims who keeps his bike in a garage pays £177 in the barren north, has little direct or no direct relationship to a pimply feckwhit with 9 points, with no garage, existing in London E4 in social housing who may well pay north of 'kin hundreds (or not).
(c) Forget what some other fecker pays. It will only please or upset you to know.... Get on the bloody phone and negotiate yourself the BEST deal YOU can manage EVERY time the renewal notice drops onto your mat. It really is that simple. Rather like crude oil, insurance is a commodity*. The only slight advantage you have is that you can haggle over the price and terms; a luxury that is not readily available you on the forecourt of BP on a wet Friday evening with 100 miles to go to home.
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Rather like early mobile phones, all you get is a load of blokes going "Hey mate, guess how small mine is". I am indebted to Sandi Toksvig for that joke.
*It never used to be. 9/11 and the internet changed that, forever. So, that's another thing you can thank (or curse) Osama and Bill Gates for.