I mean, why not? Why are we forced to play only 1 character to maximize our MF%/GF%? So far as the base stat boosts per level, I agree - keep them isolated per character. But Magic and Gold Find? Why not let us stack all our characters' Paragon Levels for an Account-Wide boost? So we can freely play whoever we want without penatly? Even if we have +3000 MF, the chances of a good item dropping are still pretty low. Just due to the fact that there are so many different variables and ranges that it doesn't really mean instant Lengendaries worth millions of Gold/$250 a pop on the AHs... I want to play all my classes, but I feel compelled to focus only on 1 due to the Paragon Leveling system right now.