Did I miss something? Since when was it determined that Nvidia was screwing Sony (aside from Charlie's assertions)?
Admittedly this is hearsay, but even pre PS3 launch I was hearing from people, whose business is to know this stuff, that Sony was getting a bad deal (cost wise) from NVidia. The only direct evidence is the continued high price of the PS3.
This isn't an advantage of Larrabee, you could essentially have the same benefit with any CPU based rendering solution.
A general purpose CPU isn't designed for graphics workloads. Sure you could take a general purpose CPU and add texture samples and other Larrabee features to it, but you would essentially be making a Larrabee clone at that point.