The reason VU doesn't want Valve to go ahead with STEAM as a distribution method is because VU has some shady behind the scenes deals with companies like EBGames and Walmart for exclusive shelf space, and likewise VU to those companies for giving them extra copies of VU's bestselling titles to sell. Some dinky little company might have difficulty attaining copies of the game to sell in comparison to the giants. VU will see a lot of money from the sales they make in those stores, and likely a lot less from STEAM distribution.
It seems that Valve is trapped between a rock and a hard place. If they cancel their STEAM distribution method they are going to risk pissing off ATI and customers who have already preordered the game on STEAM. ATI would have to end up shelling out a lot of additional money just to ship the game to people who haven't paid the $10 dollar shipping fee when they chose STEAM streaming in their Radeon 9600/9800 XT card deal. In addition to that, if they shipped it out to free for those customers they'd have to end up giving back everyone who already paid their 10 dollars. The results would be exponentially *bad*.
Edit: to Overron - unlike ID Software and Valve, Blizzard is fully owned by VU. There's no cutting them out. It's the reason why most of the big wigs left Blizzard a while back.
This comment was edited on Sep 20, 13:30.