Considering one can't even play Skyrim on PC without Steam, I'd say whatever numbers you can muster from it would be accurate to the PC market for the game as a whole.
The only PC sales figures they have are those made in brick and mortar stores by people who purchased physical copies. And if you're going to buy a Steam game, why would you go to the store and do it? The people buying for convenience digitally probably far outweigh those with the "I just like having a phyiscal copy" sentiment.
1. Collectors edition
2. Physical copy for display on shelf with other games
3. Faster install
4. Dives your DVD drive some love.
I don't support RDM. I use Steam. I consider it more of a service than RDM which is the intention of the platform.
But you cant just ignore half of what the software does.
As a service, Steam is great. It has amazing sales. I have nearly 100 games on steam alone. But on the flip side, as a DRM, it is a horrible service because of its near mandatory updates, inability to turn off steam while playing games, and when steam goes down (I till eventually) what happens to the thousands of dollars ive spent on games?
http://www.techdirt.com/articles/20120126/09565417551/why-piracy-is-indispensable-survival-our-culture.shtml
An interesting read on how piracy preserves old software that would otherwise disappear forever.
I feel that the recent PC love shown from Bethesda (performance patches etc) are directly related to the probability that the PC sales were significantly higher than the 90% console share propaganda we were fed.
I don't believe that the PC version has sold more that the console version at this time but in the long term i feel it will overtake by a significant margin.
The PC game sales are not as insignificant as the 90% share obviously suggests & it would be great to see some figures which could clarify this.
Even at 1 million PC sales, thats about $60million. At 3 million sales, that is about $180million.
Regardless of which platform sold more, PC sales god them a nice chunk of change.