...is it just me or am I missing something?
...Decades of data involving millions of takeoffs showing the incredible reliability of large jet engines and a virtual zero incidence of accidents due to engine failure after takeoff?
Yes derate saves money, because it saves the engines.
I am in a plane that has 3000 hour engines
I take it you fly Biz jets...Do you REALLY want to start making comparisons between the saftey records of airliners and biz jets?