If they had physical servers in the past - did they have data redundancy that made a SAN a requirement when moving to a virtualized environment?
If not, that would be a classic changing of the requirements and over building of a solution causing spending that wasn't ever really needed.
I wonder if they could have gone with externally attached storage (assuming they couldn't get enough into a single chassis) to support their entire 6 servers worth of load onto a single VM host?