I think that the biggest problem with PC exclusives is that it doesn't help any publishers sell their platform. If you look at the games done by third party publishers (publishers that are not Sony/MS/Nintendo), those games are usually not console exclusive. All exclusive games are either first party titles, or they utilize features that only one platform has. These games are done to help sell the console, not to take advantage of the console's user base (Wii is an exception to this, only because it's games generally aren't powerful enough to stand up to PS3 and X360 standards). For the PC, those features are the mouse and keyboard, thus the RTS, MMO, and Diablo-style hack and slash game exclusives (I know Diablo isn't exclusive, but the mouse clicking killing games don't work too well on consoles).
I think that Splash Damage isn't making games that take advantage of the PC exclusive features. So add that to the fact that publishers (those that don't own platforms) hate exclusives anyway, it's not really a surprize that they don't want PC exclusives. If they want to get money for PC exclusives, how about they make an MMO or RTS? If they can design a game that can't be played well with two joysticks, they'll probably get some PC exclusive game funding.
EDIT:
scotth266 said:
Isn't that the point though? That most PC exclusives can't deliver high enough profits to be worth the investment?
I don't fully agree with that claim, unless you're directing it towards games with huge, 8-digit budgets. In those cases, I would propose that no single platform can justify unless you know that the game will sell regardless of platform. A few points for this:
1) There are lots of PC exclusives that are doing just fine in terms of profits.
2) Blizzard/Valve/Creative Assembly/Paradox have demonstrated over and over again that PC exclusives can produce high enough profits. I am absolutely certain that Starcraft, Orange Box, and probably L4D would have turned the profit even if they were PC exclusives. The console versions greatly increased that profit, which is why they were ported. The exclusives stayed exclusive mostly because those games generally don't work on consoles anyway, which is why the RTS and MMO games stay on PC even if they're extremely successful cash cows.
3) The argument breaks down for big title games because big budget exclusives are primarily designed to sell the platform. Best examples of this are Halo 3, Killzone 2, and MGS4. Sure, you would like to profit from those, but I'm sure Sony wouldn't be commiting suicide over Killzone 2 if it helped them sell a few thousand PS3s. As for Halo and MGS, those will sell several million units regardless of the platform it was on. You can have MGS 4 as a PC exclusive and it'll still sell well into the 7-digit range.