Reason for High Reinsurance Commission

What is the driver for higher market rates for P&C XOL reinsurance contracts? Sources I have show 1-2% is charged by reinsurance intermediaries for QS contracts while XOL is 10% (though brokers in some markets are currently sharing some of their commission with the insurers). Reinsurance intermediaries have little overhead and consistent relationships with the same relatively limited group of reinsurers so what makes reinsurers willing to pay 10% for XOL contracts?

How do reinsurance brokers know reinsurers wouldn't be willing to spend more on commission (as is charged in UK)?

It's gener
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