Second: there's no "automatic" value inherent in the metric system. It's a SHIT TON easier to use with computers and calculators, certainly, as it's all decimal. But otherwise its less wieldy in daily use as 10 doesn't divide neatly by 3 or 4.
I don't understand why supporters of the imperial system use this argument when it rarely holds for them. Yes, 12 inches in a foot and 5280 feet in a mile have that property. But 1760 yards in a mile doesn't, and neither does the 8 little divisions in an inch on a ruler (yeah, I know they are called eight-of-an-inch).
It doesn't hold for weights: 16 oz in a pound, 14 pounds in a stone, 32,000 pounds in a short (US) ton. None of those are divisible by 3.
It mostly doesn't hold for volumes: 4 quarts or 8 pints or 16 cups in a US gallon. 16 tablespoons in a cup. None of them are divisible by 3. Only when you introduce the teaspoon you get divisibility by 3.
And the other unit of volume used frequently, the cubic foot, doesn't play nicely with anyone, unlike the liter which is 1000 cm^3. So a 1 mL = 1 cm^3, 1 microLiter = 1 mm^3, 1000 liters = 1 m^3. (By the way, for water the most important substance for us, those volumes correspond to 1 kg, 1 g, 1 mg, and 1 metric ton respectively, showing the beauty of the metric system.)