If you arrange the trade tab by, say, offer, it sorts alphanumerically. This means within the same good, the numbers aren't sorted.
eg
Gold 16
Gold 160
Gold 18
Gold 2
Gold 20
Gold 20
Gold 200
Gold 205
Gold 21
Gold 215
etc
Sorting the number numerically will make it infinitely easier to compare the offered goods in ascending value.
