The fanboys around here make me sick some days. Valve is one of the most talented developers in the world and they're a relatively small company that doesn't produce many games. They've made a business decision here, plain and simple.
There are three options:
1. Increase staff size and port to PS3. This would require additional work from their current staff and apparently they feel it's either not necessary or counter-intuitive to their business plan.
2. Send the port off to another company and risk brand embarrassment over a crappy port. See Orange Box on PS3 if you want to see how well that model worked for them.
3. Keep their business size at a level comfortable to them and use their assets in the most profitable ways possible and with the hardware that they feel keeps them the most focused creatively.
What would you do if you were in their shoes? I can hardly fault a smaller company for limiting the scope of their projects.
But, then again, I think Insomniac is a crap developer because they don't port to the 360. And that Kojima is lazy because he didn't port MGS4 to the Wii.

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