A lot of people have probably never tried vRealize Business. As more companies want a cloud like charging model, or to show the true cost of VMs, interest in these tools is picking up.
Usually vRB is deployed with vRA or vIDM, as it will use them as an authentication source.
One of the great features of vRB7.2 is that it can used in standalone mode without vRA or vIDM. This is great for a POC as it can use local accounts on the vRB appliance.