Well, Lore is good fun, especially centered around Cayde. But it sure isn't worth the Glimmer, especially considering how slow it is to grind glimmer in D2. Bungie should just make the maps free quests....
True but as you said other than that its not really worth it unless you get lucky and find a legendary or exotic engram. I don't think they ever will. Hell if people need a shard sink they could always have the maps be sold for shards.