I picked “Yes”, but I want to clarify my answer.
I would like to be able to have some way of obtaining Treasure troops (level them up, trait them, etc) and keep them.
The way they do it now is stupid. It’s not worth putting anything into a troop that you will lose in 5 minutes.
Maybe they could do it where the Treasure itself comes from the Underworld, but the Troops come from the main world (in a gold chest or whatever) and in that little description box it says something like “This [Troop name here] is based upon the riches/treasures of the Underworld”.
It’s just an idea, but either way, the system they have now is flawed. They either shouldn’t have them be troops at all, or make the troop a separate thing from the treasure itself and the only connection they have it’s purely for story purposes (similar to what I mentioned above).