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tokens: The authors thank Michael Dopita and Stephanie Juneau for very useful discussions, and the anonymous referee for in-depth reading and helpful comments. P.M.W. received funding through BMBF Verbundforschung (project MUSE-AO, grant 05A14BAC). E.Z. acknowledges funding from the Swedish Research Council (project 2011-5349). This research made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.