260xp for making 20 bolts. That's one log from the greater demon tree, then running to the one at the pirates hideout. Not 100% sure on the respawn time, but it's not short. Someone there claimed to have gotten 4 logs from the Soul Wars tree, and the woman does mention something about the more bloodshed the better the tree. Doesn't seem worth it for the time / effort / exp or cash. So far, anyway.