People need to learn how to read. Lesson 1 in learning how to read is to actually read the entire article even when, god forbid, you see something you don't agree with (yes, I'm looking at you NJ5). If you actually did read everything, you would have read this final paragraph that pretty much sums up the point of the article:
"But if I was a writer or analyst trying to extrapolate significant information from the resource, especially regarding those titles which don't chart regularly, given the major discrepancies with other figures shown here, I would not recommend it." (emphasis added by me)
Basically, the author is saying VGChartz doesn't have good enough data to be used by professionals as gospel. And why would it be? The site's run by amateurs. Why would professionals use VGChartz as canon? The site's great for seeing some trends and getting a general idea of sales numbers. That's not a bad thing; it's just the limitation of this site. It's not the end all and be all in sales numbers.
My Top 5:
Shadow of the Colossus, Metal Gear Solid 3, Shenmue, Skies of Arcadia, Chrono Trigger
My 2 nex-gen systems: PS3 
and Wii 
Prediction Aug '08: We see the PSP2 released fall '09. Graphically, it's basically the same as the current system. UMD drive ditched and replaced by 4-8gb on board flash memory. Other upgrades: 2nd analog nub, touchscreen, blutooth, motion sensor. Design: Flip-style or slider. Size: Think Iphone. Cost: $199. Will be profitable on day 1.
