So according to the weekly update the commendations go away for HoW and you will get 250 rep for each one you turn in.
So I had to grind to get 2500 experience for each level up and I will only get 250 rep per turn in. So it's the equivalent of two maybe three bounties. Wow..don't give us too much Bungie.
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You can be happy that you get something for that. Instead of bitching about it, be thankfull. They could have taken them out of game without any benefits.