[mathieuh]

It's like the story of the factory hiring the experienced engineer and getting a massive bill for tapping a machine with a hammer. Paraphrasing from memory:

The factory had a machine break down. They hired a few cheap engineers who were unable to diagnose and fix the problem. Eventually they found an experienced engineer who fixed the machine by tapping it with a hammer and charged them $1,000. When they asked for an itemised invoice they got:

Tapping with a hammer: $5 Knowing where to tap: $9,995