While it sucks that this study doesn't include the online sales you can't disclude retail from the picture either. I find some of the best deals on pc games in retail. Steam is pretty good and has some great deals but not many can beat target when they decide to stop carrying a game and put it on clearence. (
An alternative note is that I went to buy farcry 2 from bestbuy the day it was released. (I had a giftcard and didn't know how big of a mistake buying that game was going to be. No offence but I didn't care for it.) They had all the xbox 360 copies out on display and I asked them if they had the pc version. The guy spent 10 minutes looking up the release date to see if he could sell me a copy and then spent another 10 minutes in the back looking for it. I think it shows the retail state of pc games.
An alternative note is that I went to buy farcry 2 from bestbuy the day it was released. (I had a giftcard and didn't know how big of a mistake buying that game was going to be. No offence but I didn't care for it.) They had all the xbox 360 copies out on display and I asked them if they had the pc version. The guy spent 10 minutes looking up the release date to see if he could sell me a copy and then spent another 10 minutes in the back looking for it. I think it shows the retail state of pc games.