It's the engineer in you.
Seriously though for an analogy, my dad (Aerospace engineer) always prefered drawing up his OWN plans to scale when making flying model airplanes and generally hated kits. Different obsession, same thing.
Pit Beeatch for Team Munchkin
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"...In nature, there are predators. I believe the common denominator of the universe is not harmony, but chaos, hostility and murder..." Werner Herzog