Well, not sure if this is what is being referred to here, but there is an issue with using POTD to level vs other means such as the DF. Since you get barely any money and no gear from POTD, you basically have to keep doing POTD until level 60 after you get past level 55, as the upgraded end game armor iLvL falls behind after that point. Not to mention I think we are about to hit another age of this with the next deep dungeon getting released in the following patch.