We've had three claims in three years - once when our caravan was damaged by Ann Other (who didn't own up), and twice when we've accidentally damaged it ourselves. (Once on site, when we failed to see a site barrier in torrential rain, and this year when our tyre had a blow out and damaged the wheel arch, wheel cover trim, and internal floor to the van). Every time we've claimed, paid our excess, and the remainder has, each time, been more than the premium we've paid, twice by a significant amount - and we don't pay anything like the amount you pay (less than half, in fact). It hasn't gone up significantly despite our claims - so in our case, at least, the insurance company is not making a fortune from us.
Our friends van was damaged by fire in an arson attack, and because they were insured they were back on the road, with a new van, within three weeks.
As said, you 'gamble' on the premium paid outweighing the possible cost to you of any perceived or actual risk - and the choice is completely up to you. You can just decide not to bother paying any more, and take the risk upon yourself.
To me