Since rare enemies in every event that will be made post-completion of the 36 provinces in the Maps beyond Season II/Atlantis, a minor QoL idea that could be done is having some form of a coin indicator whenever rare enemies are defeated to let players know whether or not repeating stages and killing one of them is worth the work and wasted energy for 2 to 10 coins, especially when we’re out of loot tickets to fast-track this process.
Suspicious Chests and Orichalcum Seadragons would be exempt from this, since they always give coins regardless how many times you appear.