I thought these were reasons enough whey they have a 360 hooked up:

not to mention the PSX port of Castlevania Symphony of the Night on XBL.

But anyway I know Kojima only wants to keep his metal gear on one console and thats a sony one.

Of course MGS4 isn't doable on the 360 nor MGS5. With the amount of videos in those games, it's impossible to fit in one dual layer dvd, hence the advantage of having a bd disc. It offers developers more space to put extras and videos.

360 does have game that PS3 doesn't from Konami, and it's the DDR series.

While I won't argue about the Valve's ability to create multiplat games; using Insomniac as an example is a pretty flawed argument in this respect.

Insomniac despite being independent is almost as good as a first party 'family' to Sony. Sony first party studios (in particular Naughty Dog) frequently share technology with them and they've established a strong relationship with Sony that allows for risk free endeavours.

There is a reason why Insomniac is setting up a second develpment studio while many others developers are laying off staff or shutting down entirely. Their working relationship with Sony is solid, they know the hardware, are given special preveliges only availible to first party studios, they enjoy financial stability that comes from a guaranteed publisher and at the same time can exercise the creative freedom from being an independent studio.

Valve has no such incentive to remain exclusive, a more comparable example would be Bethesda who while not entirely ignoring the PS3 are certainly pro MS (Althought pundit could scream moneyhat and have a good case for it).

Valve have no experience working on the PS3, it would take too many of their best developers to produce a PS3 version of say L4D day and date with the Xbox 360/PC releases.

This could be said for every other developer when they first began development of a multipat game for PS3, sure Valve may have better quality control than say EA and less financial muscle to take the brunt of a fail game, but does that meean that Valve will simply look at any future project and proclaim 'too hard, cbf?' That seems a bit too defeatest and pessimistic.

While I think that part of the issue is expirience, there is certainly also some level of biasness in their bussiness decision. (And no its not pro-360, its pro-PC, the 360 is an afterthought.)

Valve knows their audience, they know how to sell to them, and they know how to work within certain architectures. They don't have the resources or the manpower to bring games to the PS3 at the same time as the 360. It would take forever and a day.

Again I understand they have limit, my question is whether they will ever bother? I simply cannot believe that after 3 year out on the market, they'd simply say the same thing as when the system first launch: too hard, can't be bothered.

Where does it start? Never? Does that mean that Valve will never adapt to a shifting market? What happens when the nextbox comes out and is equally hard to program as the PS3 and indeed the PS4? Does Valve just throw up there hand again and say 'I give up?' Thats a great bussiness model isn't it?

No this isn't just about expirience and resource, there is absolutely a level of biasness working here, it might have started as a bussiness decision but in today's market, this argument just doesn't hold water anymore. I see an equal amount stubborness and laziness getting mixed in.

Yes. They will most likely not ever bother with the PS3. Their investments and knowledge lie in other architectures. That's just how it is.

It's not bias, it's business economics. Don't forget that it's not just a matter of expense of porting vs. increased revenue from multiplat sales, the sales Valve also means that there's a higher premium on their man hours. In the time it takes them to build a PS3 version of Left 4 Dead, they could probably just make another game altogether.

If all developers think this way, we'd still be stuck with the SNES playing 2D platform.

It is good a good economic decision so long as the statue quo is maintained.

Think of it this way, the first PS3 game might cost additional fund for Valve, after that the net revenue raised for each additional port which won't take as much effort as the first game will eventually make the endeavour a commercial success. Even Gabe admit that the PS3 cannot simply be ignored in the future anymore, this is short term cost saving policy that take away long term revenue by limiting your audience.

hmmm...If kojima is making it then it's almost certain to be exclusive...I mean they didn't port mgs4 to the 360 back when ps3 user base was a lot smaller and 3rd party companies are going multi plat like S-E, Capcom etc because they want more $$ and there were tons of mgs4 comming to 360 rumor poping out every where and still despite all that it stayed exclusive and sold well.