Revenues from downloadable games in the US will leap from $52.7m this year to $760m in 2007, according to analyst IDC.
Broadband is key to the surge in interest, along with more refined business models from games firms.
Schelley Olhava, interactive consumer services programme manager at IDC, said in a statement: "After years of experimentation and evolution, the online PC gaming industry is closer than ever to reaching substantial and ongoing profits.
"From serious gamers playing role-playing games, such as Everquest and Ultima Online, to casual gamers playing pool or poker and everything in between, gaming has become a viable and mainstream online entertainment activity."
IDC's study reported that the downloadable gaming model can be very profitable, quickly creating a lucrative income stream.
But the analyst warned that the market may reach saturation very quickly.
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