If memory serves me correct, the biggest reason is because it is very hard to track PC sales. You can't track services like steam, or downloads straight from ebgames.com
Also, if the site was to only show retail sales (like walmart, bestbuy, target) then the games pages wouldn't reflect actual sales. And you would then have people coming in saying "game X sold 5m units but you only have it at 2m". However, those 3m may be from download only sources.
Where with console games, almost all of them are disc based only and are much easier to track. I mean sure some you can also download, like Burnout or GT5:P, but they are the vast minority.








