Virtualization is cutting out the middle man here, as an investigator I'd rather have a virtual machine instead of a disk image. Virtual machine copies provided by service providers provide a "self contained crime scene", since the virtual machine is frozen in time including the memory. At DojoCon 2009, Richard Bejtlich shared a story were investigators responded to an incident working with a Cloud Provider and were greeted with a shrink wrapped crime scene.
Anyone who as ever used a product such as VMware may have copied and moved images, this is a good thing. It seems that when some are dedicated to screaming about problems, they may be ignoring a great solution staring them right in the face.