that's because PC games usually have a longer life (especially on steam) and L4D 's life was kinda cut by L4D2.
Let's not forget also that Steam grew a lot since then and that the audience that was there for P2 was not there for L4D.
The other factors are that A) it's a zombie game. B) L4D2 is about the same price so people go thowards that first.
still L4D as only on 360 and not PS3 no? so that's even more of a gap to portal.
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