Kept apart because the price is not comparable: $640 a year for three letters, $160 for four, against $5 for everything else. The Value after carry column answers "would I pay this every year, forever": raw rating minus a fixed carry dock of 1.5 points at $640/yr and 1.0 at $160/yr. Tables sort by value; the raw rating stays visible beside it, so an excellent-but-expensive name is still recognisable. Words and numbers are split into separate tables because numbers ride their own collector scale.