Digital sales take up a good chunk of the PC market. Skyrim remained in Steam top sellers list for quite a while.
http://www.ign.com/articles/2011/12/16/skyrim-is-the-fastest-selling-game-in-steam-history
That combined with a history of NPD and VGC (lol, VGChartz ...) massively underbilling PC sales figures due to missing Steam / other DD date (and incompetence or corruption in VGC's case) tells me there's something we're not quite seeing here. Portal 2 sold more copies than either console version, and VGC has 0.61M PC versus 1.55M 360. Crysis sold "over 3 million" copies, yet VGC has only 0.68M. I wonder how much Portal really sold given that it's a Valve game and PC gamers buy the [censored] out of Valve and Blizzard (10M sales D3 as a PC exclusive) games ... If Crysis 1 which basically no system could max for over a year can sell 3 million copies on PC, how much did the highly anticipated Valve game really sell? We already know Portal 2 sold at least a million Steam copies to account for the gap with the 360 version. How many more?
Since Skyrim is the fastest selling Steam game of all time, I'd bet PC sales at minimum are literally double what's listed, which would put it above the sales of the PS3 version. Combine this with how quickly Beth's attitude about PC in press releases turned around post-release "we're doing this as a courtesy" and "it's tradition for us to release tools so we will continue it" almost instantly became "fastest selling Steam game ever!", "We're doing something
extra special (official HD texture pack) for you guys when we release the CK! Also we're partnering with Valve to add a centralized mod hosting service!", and http://www.joystiq.com/2012/02/08/todd-howard-over-10-million-skyrim-players-average-pc-time-75/
Wait, what?
Many million!? B-b-but Skyrim sold less than half of the 360 version's copies! PC gaming is dead you entitled, whiny pirate scum! Bethesda are doing you a favor by releasing on PC at all! You don't have the right to complain about anything!!!11!!!one!!! PC is for spreadsheets and farmville

. So. How many million is "many million" anyway? I can tell you right now it's not 2.5. Given that other games (I've listed two already) literally have 75% of their sales missing from VGC (smaller gap on NPD, since they're more professional), I'd be very, very interested to know just how many millions of PC copies sold is "many million" to Bethesda. In any case, the
absolute minimum of extra copies Skyrim sold on Steam is 1 million. It literally cannot be lower than that because of Portal 2's "Steam gap" in its sales statistics. Portal 2's peak user counthttp://hardforum.com/showthread.php?t=1650947 http://www.neogaf.com/forum/showthread.php?t=451769
The given sales breakdown for Skyrim, bearing in mind that this data source is literally worth less than used toilet paper for PC sales figures (less than a million Crysis sales versus "over 3 million" direct from Crytek), is:
X360: 6.5
PS3: 4.24
PC: 2.55, but
at the very least 3.55 in reality
Yeah, 2.55 sure is "many million" and enough for Bethesda to do a complete 360 on their attitude about the PC version. PC gaming confirmed dead. While we're at it, Xbox 3 will be 5x as powerful as even the most expensive PCs and PS4 will be 7x as powerful but expensive and hard to develop for. Durango has 64GB of RAM and a 16 core processor lelelelelele PC is finished!