The prices have NEVER made much sense since the modifiers were introduced. There are weapons with slashes of 1/10th (yes, one tenth) which have sold for over 100,000 trias. And we know how much dark, frosty, fire, scortched, icey, iron, and silverweave weapons sell to Harnquist for.
It's still a work in progress. It used to be that you could have up to ten modifiers on a single weapon, and they'd all be culmulative. Now, I don't see weapons with more than two modifiers, and only the first modifier counts in determining the properties of the item. But that has other problems associated with it.
At least we don't have any more 300 slash daggers, or quest items that sell for 85 million trias...