How often have you done calculations (of theoretical yield and everything else) where your result isn't
a neat number like 10.00 g? I think that thanks to Benford's Law
, 1.000 * 10n
, (i.e., 10.00, 1.000, 0.1000, etc) is actually (slightly) more likely to be encountered in measurements of natural or social phenomena than any other number with four significant figures, but even without that, hey, sometimes you'll get a surprisingly clean-looking number from an empirical calculations.