You won't get anywhere near $150. Vit isn't bad, but it's a secondary stat, not a primary in terms of dps. WD's want int on daggers because it increases our overall dps. A 950 dps dagger with no int is far worse than an 800 dps dagger with 150 int. Put it up for $50 and see if you get a bid, don't put a buyout. If not, try selling it on the trade forums.
I have a few friends who play WD (including myself) and when we search for a weapon, we always filter by "has int" and "has socket". I don't ever change them becasue anything less is garbage.