Well, when this site started ioi wasn't much reasonable about disclosing his sources and methodology - that didn't make much for vgcharts rep at neogaf. Also, the neogaf guys need to keep in good relationship with npd - so far the brief snippet they release monthly is the only reliable bit of american sales data they get and want to preserve it. Add 2+2 together and you'll see why vgchartz is banned over at neogaf.