I'm naive on this topic, but wouldn't a high number of claims be either neutral or positive if said level is anticipated or consistent (as in the crime-ridden metropolis of LS or LC)? Ultimately, all policyholders will pay through higher premiums, and it'd be easier to make a profit (in absolute amounts) on high premiums since bumping up $1000 to $1030 looks a lot less onerous than $300 vs $330. As I said though, I'm naive on this, but I'm guessing only unanticipated high levels of claims would hit insurers hard.