I've worked with EE's who spec'd a $300 high quality motor when a $20 one was powerful enough but didn't have lifetime specifications because the extra $280 was

I've worked with EE's who spec'd a $300 high quality motor when a $20 one was powerful enough but didn't have lifetime specifications because the extra $280 was less than the cost of the service call to replace the motor. When you start designing things to last a long time AND be very reliable, the cost increases very quickly in ways that are not always predictable.