Yes, leveling up fast has its backside in short term, but in long term: you can have access to the best bosses with the best drops, the best adventure/job drops and every new unlocked empire/city property gives you a significant boost to your income. While with a slow progress you will do some old and weak bosses and adventures for years and your income its very limited. And you forget that a new player has a significant disadvantage playing against the players who sit in their level range for years and already are full of the best drops unlocked at that level.
My reason for faster levelup was to unlock the best content and get the best drops for my stamina and energy and my time. Now that they stopped releasing new city's in Viking Clan I stopped leveling with level partners to, as I am ready for 3 new locations while there is no ETA for the next one.
Last edited by a moderator: Nov 7, 2014