Here is the thing, Wizards may have some cool abilities and may beable to exploit the system but they are a Glass Cannon, the fact they suffer from mortal vulnerabilities makes them a lesser lifestate then Vampires.
They also need to keep consuming a potion over and over again, not a problem if you are playing with them but once you go play with another household then your going to be at risk, I doubt they will autonomously take the Potion of Rejuvenation themselves otherwise your going to end up with the majority of all wizards as old people.