This is the same thing that happens with everything "cheaper" once you add up the hidden costs nobody puts on the price tag. Gardening, home repairs, even brewing your own coffee, the sticker price looks great until you count your hours and the stuff you waste. The math only works if your time is free and you never mess up, which is not how real life goes for most of us.

Scales exist for a reason, eyeballing is just gambling with extra steps.

Filling early isn't the issue, it's the base slipping.