Geez, you typed all that out without realizing the whole point of what I was talking about ?? I was talking about SOFTWARE not HARDWARE. Of course people are going to realize that they are not going to run the latest games on older hardware and netbooks .. I mean any old noob knows that. So again your point is invalid.
Let me spell it out for you.... SLOWLY:
1. Recent distribution + nVidia hardware + nVidia blob drivers + recent platform should perform more-or-less on-par with Windows XP. (And I've got numbers to back my case)
2. Linux users tend to be far more computer proficient, and tend to select their hardware accordingly (do you claim otherwise?).
3. Linux users are used to living in a no-support / community support environments.
4. Linux users are far better accustomed to filing meaningful bug reports and support request.
5. At least according to Phoronix' own surveys, nVidia's Linux market share (percentage wise) is far higher then their global market share. (By an order of magnitude) and on part with their Valve market share. (Even though Valves surveys target gamers while Phoronix' surveys target the general Linux-using public)
So, if you do the math:
Linux users are more likely to have Source-engine compatible hardware (Repeat: Recent distribution + nVidia hardware + nVidia blob drivers + recent platform) and are far more-likely to be able to fix their own problems (as opposed to flooding the tech support lines with "Crysis no workie on my single-core-ATOM with 945 chipset!" calls) than their Windows-using counter-parts.
So in short, technically speaking, the Linux eco-system is (far) better than the Windows eco-system. (Do I hear applause?)
Now, I doubt that Valve will port Source engine to Linux (most likely because of the limited user-base) but technical merits have nothing to do with.
Are we done yet?