You're definitely right, though with PC I just feel as though the major markets lie in the MMORPG and F2P genres. MW3 on the 360 has about 500k active players at any one time i believe, whereas MW3 on PC has about 70, which is steams 2nd to 3rd most played title.

It's not really steams fault, but more to do with PC gaming in general. There's so much variety as to what you can play that you'll be hardpressed to get incredibly large fanbases for any single game that is available on steam. It's just more apparent to me since I live in Australia. For instance from the 70k playing MW3 i doubt even 5% are from Australia. I never have problems finding local matches on console no matter how old the title is. Fat princess for example is still going strong, though It could just be insanely popular and I don't know.

Meanwhile elsewhere, you have WoW, Swtor, LoL, and Maple Story with 100s of thousands of active players outdoing console games.

You're definitely right, though with PC I just feel as though the major markets lie in the MMORPG and F2P genres. MW3 on the 360 has about 500k active players at any one time i believe, whereas MW3 on PC has about 70, which is steams 2nd to 3rd most played title.

It's not really steams fault, but more to do with PC gaming in general. There's so much variety as to what you can play that you'll be hardpressed to get incredibly large fanbases for any single game that is available on steam. It's just more apparent to me since I live in Australia. For instance from the 70k playing MW3 i doubt even 5% are from Australia. I never have problems finding local matches on console no matter how old the title is. Fat princess for example is still going strong, though It could just be insanely popular and I don't know.

Meanwhile elsewhere, you have WoW, Swtor, LoL, and Maple Story with 100s of thousands of active players outdoing console games.

Pretty much. Same with Dragon Age Origins; I had to get all the DLC through EAs in-built system and achievements were on my Bioware profile rather than my Steam ID. Fallout 3 was much the same but through GFWL. Essentially, the only real advantage you have then is that your game is tied to you Steam account.

Skyrim however is a Steamworks game. It backs up saved games via cloud storage and you have Steam acheivements. Bethesda have also recently started doing Beta patches (again using Steams Beta participation system) so they can find problems with future updates before they officially release them. I think version 1.4 beta should be up soon if it's not already. 

Okay, but if Skyrim is a Steamworks game how do you explain the total $2 billion revenue for Steam, which suggests 100-200 million copies sold if the average price is $10-20, while the article says only 14.5 million Steamworks games were sold? The vast majority of games sold on Steam aren't Steamworks games.

For example, all these best selling Valve games like Half-Life, Left4Dead, Portal and Counterstrike, who sell millions through Steam, aren't they Steamworks games? And who are all these 100 or 200 million non-Steamwork games sold on Steam?

Not sure. The Valve games are all steamworks games although some weren't when they were released (e.g. Half-Life 2, Counterstrike). Maybe they don't include Valve games? Alternatively, it could be because they don't include physical sales in the 14.5 million figure. I bought my copy of Skyrim off Amazon but it still registered on my Steam account.

On the revenue however, it's worth noting that it encompasses all Steam games and microtransactions & DLC will contribute towards the total so it's not neccessarily 100-200 million games sold. 

The real question is... does it count Team Fortress 2 hats?  If so that's probably half the revenue figure there.