Other than actually playing them out, there’s really not much else to do with Treasure Maps.
The main issue that is commonly brought up is that the game mode is unrewarding for the time invested. I’d argue that the onus is on the player to make the game mode rewarding by becoming efficient at it.
I’m certainly not some expert “Treasure Hunter,” but I am competent enough at it to create a vault every two to three minutes (for the first two or three vaults… then, the board becomes obstructed, and subsequent vaults can become slightly more time consuming).
And, even with RNG dictating the eventual rewards from the chests/vaults created upon map completion, a player can still produce enough resources to bolster their account some. I mean, I play Treasure Hunt exclusively, and have you seen my account lately?
(And, I even do this with a rather severe visual impairment, meeting the federal threshold for legal blindness. 
)
Suggestions have been made for maps to also become a resource available to use in the Soulforge for crafting purposes, which seems like it could be viable if thought out (and executed) properly. Some (many) players have a grandiose number of 'em, so considerations to the game’s economy and competitive advantages and such would have to come into play, but it could work, maybe?
I guess no one else just plays them for the cascades anymore. 