Kinda hard to find a publisher for an exclusive PC title.
FFvsTR and SWAT 4 didn't do that well either

And Tribes: V? ~100K copies sold? How low can you go?
Stupid PC gamers, buying only HL2, WoW and BF2.
It pains me, rips my flesh even to say this but Irrational should go for the simplified console market if they want to stay afloat. You don't make big bucks in the PC area if you aren't Valve, id, Epic, BioWare or Blizzard.