I think one of the largest excuses for making this "minigame" (so far) a skill. Is because by making this a skill and introducing prestige exp in between, we don't need to grind the highest lvl dungeon we can explore all the time. And concerning another post saying 99 dung is useless, it isn't, one thing is that it lets us bind more items, which makes the dungeon faster to explore since you wont need to make everything from scratch, and this will considerably increase xp/hr in the higher levels. The second thing is at lvl 99 dung you would have 1,3 mil tokens, allowing you to buy almost every item, and there will possibly be released even higher level items that requires i.e 99, 110 or 120 d'eering to wield or use.