I don't think you can install Vista using Bootcamp, due to Microsofts licensing on virtual software prohibiting installing Vista on anything other then an originally Vista-licensed PC.
But you are installing on a hardware platform that you bought the Vista Retail for - OEM licencing yes (locked to PC), but the Retail is different.
There's no VM running with bootcamp - just a loader at the start. Even the HD is a real partition unlike parallels/vmware with a file.
Also that would forbid any windows based VMs running windows VM instances too.