You can put that down to absurd PC component prices.
What? You can get decent kit for next to nothing at the minute!
you can't help but wonder what if it was released on consoles - it'd get the audiences it deserves, and Crytek wouldn't be doubting themselves so much. I know EA isn't particularly pleased with the figures, and they would most likely be pushing for multi-platform releases of future iterations of Crysis.
I doubt any current console would be able to handle Crysis, not without cutting corners and scaling it down drastically, so I cant see the sequels coming to anything other than PC. If they'd have made it multi-platform, sacrifices would've had to be made and the game probably wouldnt even resemble what it does now. So for that reason I hope future iterations never come to consoles.