Spending 25k simply to virtualize dhcp servers is a bit of overkill; however, that doesn't mean that a simple virtualization setup is undesireable. It does give you hardware independence.

I am not an "all in" virtualization guy by any stretch of the imagination. Not comfortable on the firewall...and you do lose performance, obviously, over what you have on the metal. But it is undeniably here to stay, and it can be used by all sizes of shops to improve their situation.