Quote from JetsetlemmingI'd expect better of you being European, claiming 80% of the market is consoles!
90% of all online gaming in the US is PC according to an NPD report last year, and L4D certainly counts in that group. It's far bigger in Europe, more and more the further east you go.
Altho I highly doubt those numbers (from both of you), then I think you two need to differentiate between online games and SP games. If you want to make SP games then you can't make em for the PC (exclusively) anymore unless you want your economy to get warezed to death.