Why are Crysis's and UT3's Sales Horrible?

[Bond]

From Kotaku:

Crysis and UT3—both hugely anticipated PC titles—didn't see much success in November. Crysis moved just 86,633 copies (admittedly topping the 68,600 that were predicted) over 18 days. Unreal Tournament 3 fared even worse, selling just 33,995 copies (way short of the 70,600 that were predicted) over 12 days.

Any ideas? The low sales for Crysis make sense because of its ridiculous system requirements, but not so for UT3...