Allow them to either be sold on the CM, or increase the Vendor price of them.  Yes, running them is good silver, but it's not fun to do so.

+1

I am going to be the devil's advocate here and say...

Running these scroll types is NOT good silver, and the items take too much inventory space as they cannot stack. I propose that the venom fang be changed to act much like a fairy wing. The item should be stackable, and then exchangeable via NPC for the summoning scrolls. 

Doing this change would alleviate many of the problems that come with this item's lackluster existence.