Regrettably Mages putting AI on them doesn't convince them they can jump off a ledge.
He will hit harder and live longer, which all adds to your DPS. You may be able to find these on the AH and I would assume raiding hunters will be bidding up the price for them. You can make them with a chunk o' mammoth meat and 1 northern spice. The recipe requires cooking 400+
As you can see, Hammersmasher was happy to get a treat. Now I just need to go find some mobs for him to work off all those extra calories on.