Basically. I seem to be one of the luckier ones and tend to get at least 1 legendary engram out of the 5 caches but for most they either get meh blues, an emblem or nothing at all. You really don't make your glimmer back with those stashes.
I'm fairly certain their point was to give players something to hunt for every week and sprinkle in a bit of lore for our favorite Hunter Mentor.
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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....
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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.