Dorian Bloch, GfK Chart-Track director, expects the digital download market for PC to be worth over $1 billion in 2009 thanks to services like Direct2Drive, Steam, and Metaboli.
Bloch estimates the market accumulated close to $600 million last year, with publisher's relishing the idea of including sales number's in GfK Chart-Track's data.
"This is a huge business," said Bloch at Develop. "The key thing for me in this is that these publishers support me in what I do and they want their sales included in the charts.
"Sega has been asking us, 'when can we include our Football Manager sales in our charts?' We'd like to include them, but I can't just include one publisher's sales, I need a balanced approach for doing that."
Bloch said that the only way to include digital sales in the company's data, is for a wider selection of publishers to start providing sales statistics.