What's going to happen, though, if a manufacturer starts fixing his prices? Doing so opens a door wide to his competition and invites them in. That's probably why, when asked, nV said it probably wouldn't work, etc. Now, if nV and ATi together conspired to fix prices, then *that* would be price fixing.
Sure, but the competition is questionable in certain markets (ATI/AMD doesn't compete at all atm at the very high end) and a few % here and there isn't always going to make enough of a difference to a generally satisfied consumer.