okay, allow me to break it down for you. You suggest that the weapon is *GREAT* for a Paladin, but even as a DR breaker it isn't very good. Let me explain why, a paladin due to their limited smites have to maximize the damage output they do with them, therefore a weapon with a high critical profile benefits them the most. A longsword, does not have a high critical profile, nor a x3 critical multiplier, both of which the paladin benefits from.
Then you suggest it's GREAT for a Paladin so they don't have to craft a mineral II, yet a pure Paladin shouldn't EVER have to do this with the holy sword spell at their disposal. And considering that the holysword is much better than this weapon in both critical profile, and critical multiplier, and it bypasses all DR in the game this weapon is therefore trash. Vendor it. Unless you know someone with an excessive amount of scrolls and a flavor build WSS paladin then you aren't going to find a buyer.