I know that my VMfusion on a mac that runs ESX has 3d graphic support and I just googled ESX and 3d graphics which turned up results that indeed point to YES it does support it.

I dont believe the overhead would be large to run 10 vm.

We have a Virtual Center right now that is being setup and will run 3 ESX servers with 100 VMs on it.

What this getting me thinking about is a multiboxing VC in which you would pay company X for Y amounts of VMs to box Z game. Bandwidth would be an issue but man that would be epic.