What about if we can use more maps to obtain a multiplier in Treasure Hunt?
Nothing too generous that can affect game economics but something like could compensate the time consumption of that mini game to make it useful.
An example could be:
Use 1 map = Multiplier x 1
Use 5 maps = Multiplier x 2
Use 10 maps = Multiplier x 3
Sure you will get less rewards than using the maps individualy BUT you will be saving time and would be using all those maps we all probably have saved.
Its just an idea and open to suggestions.
Have a nice day!