Pro's I would like to see. Undead raising, Charm spells, resistance to frost....you know...just kinda keeping in line with the originals.
I gave mine away to the first person who found me, will do it again in four days.
Honestly just doing normal questing in Reaper's March once you're of the appropriate level will probably expose you to one bite or the other. The people paying for it are simply impatient, or really low level (which means they can't do the quest to access the skill line anyway).