Yes, quite a bit of time. The convenience was too tempting. I'll look for better sources, but it will take some effort. And actually, in Wikipedia we do place less emphasis on certain types of articles above others. A list like this is nowhere near as important as the actual Michael Jackson article. You can say what you want all day as a normative principle, but I'm telling you that, descriptively, Wikipedia operates like this all the time (ie. weaker sources in "weaker" or less important articles). You'll find that articles like this one, relating to the awards that a musical act has won, cite fan sites endlessly because they are the ones that usually contain that information in one concentrated place.