Lies, damn lies, and statistics.
Why can't they include a link to all of the data in the article so we can see how the text was derived (spun?)
Severity = 10. If that is the most severe rating they have then I would expect it to mean "the boat went down, all hands were lost". I suspect it instead means "we spent $20K to settle this claim, and prefer to spend less than $5K". Would almost bet that:
Severity = Cost of Claim in dollars/1000 (maybe 2000)
What is the makeup of the insured fleet? I know it doesn't include my multi, we only carry liability (personal choice, YMMV), but the new $500K cat right behind me does carry full coverage (required by his loan). I would argue that we have the same risk of lightning strike. If one occurs his will show up, and, given the cost of his boat will have high "severity", while mine won't appear in the statistics. So, really need to know the composition of the insured fleet to draw any inferences.
Otherwise just a bunch of speculation and hot air. Oh wait, this is CF