Now in part, I'm very sympathetic to you all who have really good computers...but seriously, I mean seriously, I think your understanding of what "most" people have as a PC is a little biased...
The people who are really into games and bother to even post anything on the forums are on average going to have systems better for gaming....the typical specs we forum posters have are higher than what the typical person who plays sins or any RTS has...
Now, there is a difference between having an average modern graphics card and a crappy 6 year old graphics card...and I am completely understanding of the push to not limit games just so they are compatible with old cards and what not...but making use of modern graphics and forcing people to have the latest and greatest are two very different things...it might be nice for some of you people to have a game lthat pushes the current limits...but for a great many of us, those games don't work on our systems or are really slow...and guess what happens? We don't buy them....
With all your criticism against cheapskate gamers you are also missing a huge audience...laptops...
I don't know what you all use in Europe or the eastern block but in America, a large portion of your high school and college students are using lap tops (hell, even some kids get their own laptop)...and in America, that is a massive audience for computer games...in fact, the only other large group of gamers that would play something like Sins are young adults who were high schoolers and college students that grew up with computer games (a booming market since the 1990s, arguably a little earlier)...
You claim that post-Soviets can afford a nice desktop...well that's great, but I bet there's no way you'd pay for a comparable laptop (assuming you could find one) unless you are really being modest about you're financial situation...the gaming laptop I have now is about as best a gaming laptop you can get short of Alienware, and I easily could have gotten a better desktop for half the price...
Sure, a lot of gamers here in America have hella nice computers that they built themselves...but a lot don't, because financing a desktop and a laptop is expensive, even if one of them isn't designed for gaming...
The even bigger issue with laptops is that they are rarely upgradeable...depending on the model you might be able to change the hard drive, but that is usually about it....you can criticize desktop users for not willing to upgrade their ram or graphics card or whatever, but that argument does not work for people who depend on lap tops...
The university I go to is almost entirely engineering and science and pools heavily from nearby suburban areas...I can say with near certainty that the quality of desktops and laptops you will find there is much higher than the average PC most sins people are using...of the six friends of mine that have played sins with me in the past and go to that university, only one uses a desktop for gaming...the other five depend entirely on a laptop if they want to play sins...
Now I know that is anecdotal evidence, which usually I think is crap...but as far as I'm concerned, pushing the limits of processors and graphics card is not what makes a good game anyway, and is not the best business model to go with...
I would very much like to see Sins 2 have the potential to make the most of the latest graphics cards and quad-cores....but if the game is incapable of running well on an average system, then that will be a huge detriment to sales...creating a game that requires a top of the line quad-core to even run well is not a good idea...a game that requires a really good dual core even is severely pushing it...
On the bright side, writing games that support dual-cores will be a huge improvement for people with moderate dual cores that have only average processing power...graphics could be an issue unless the game is flexible...I swear if Ironclad tries to pull a Crysis with Sins 2 I most certainly won't be buying the game...