If you want a continuous measurement of how accurate VGChartz really is, you should check out my weekly adjustments thread. It's not, by any stretch of the word, perfect, but it does keep a record of how accurate or inaccurate VGChartz really is. Unfortunately I only recently started the thread, so it goes back on 12 weeks so far.
http://www.vgchartz.com/forum/thread.php?id=85041
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