Treasure hunt is only worth doing when you just started playing.
But the higher level you get, the more useless it gets too. The rewards are absolute crap and its basically a waste of time. And everyone uses the treasure maps to make vault keys.
So hereby my suggestion,
Make it so we can use multiple maps at the same time. For example using 100 maps at tne same time will give a x90 - x100 rewards. (Has to be adjusted to not break the game 
)