According to http://www.alexa.com/ GameSetWatch was tracking 1/7 the site hits of VGC at the last recorded benchmark in June... these people aren't exactly anything special.
That said, all data trackers provide nothing but estimates. ALL. Famitsu and Media Create differ as much as 40% on a given week, and each one tracks more of the Japanese market than NPD tracks of the NA market. Pretending any sales data gives anything more than a basic idea of sales trends is laughable.
Sales data is a guideline, not facts. This is true about any tracker on the market. We provide a guide... a rough estimate. A general idea of the direction of sales that can be used to determine more about the market. As long as we are under official shipment numbers we are doing a reasonable job of showing people the direction of the market.
