The nVidia GRID cards do not have local video output but the "regular" cards modded into K2s do. If you are sharing a modified-to-K2 card between several VMs, what shows when you hook up a monitor to the outputs?
If you are using one ESXi server at home to virtualize, say, 4 desktops, wouldn't it be nice to have one video card with 4 display port outputs displaying one virtual machine per port. Then pass-thrugh a separate usb port to each VM and use display port based KVM-switch to switch between the VMs.