It is very expensive to achieve high unreliability. It is not uncommon to increase the cost of an item by a factor of ten for each factor of ten degradation accomplished. ↗
Once we are fed, heated, housed and healthy, our extra consumption inevitably has an element of luxury about it. And once luxury enters the scene, the practicalities are in trouble, as women who wear expensive stiletto heels can testify. ↗
I come from Montana, and in eastern Montana we have a lot of dirt between light bulbs. It is expensive trying to bring the new technologies to smaller schools to upgrade their technologies to take advantage of distance learning. ↗
I'm an anorak. I've always been an obsessive collector of things. Richard Briers collects stamps. I collect cars and guns, which are much more expensive, and much more difficult to store. ↗
Another time factor is output: proofing and printing. That is, getting your work out of the computer and onto paper and having it satisfy you. It can be time consuming and expensive. ↗