Benedict is in such poor health that he can hardly walk at times and has been banned medically from long flights. My friend says he is blind in one eye but I have not read that. So his life will be like one in an assisted living facility for the well-to-do. With such poor health and having to live in the Vatican, the money will not mean much to him. I myself would like neither to be a Catholic nor to be a Catholic priest. And I myself imagine that life in the Vatican is very confining and boring. At his age, there probably is no one left at home in Germany so that he cannot even return to his native land.
The Pope historically lived like a king and had an income from land that he owned in the Papal States of Italy. The Italian government, as you know, gave the Vatican some small amount of money for the lands that they took. They got the money about a hundred years ago. Recently the Vatican has been running a deficit of 5 million dollars a year but no one knows exactly how much cash they have in the Vatican Bank--a few billion dollars. All that art, etc., that they have is somewhat attached to the buildings or part of the cultural heritage of Italy, so that it cannot be reasonably sold and is an expense except that people pay admission to the collections. Huge old buildings like they have must have terrific maintenance costs and no one would build buildings like that anymore. They also have terrible security costs as they have a well-armed and trained security force there. The whole complex is a medieval nightmare of high overhead and extravagance that they don't seem to be able to back away from. They believe that they have the bones of the Apostle Peter in the basements as the complex was built on a burial ground that takes its name from the Etruscan goddess of the dead--Vatika. They are convinced that Peter was crucified there because Constantine built a church there.
It is their financial problem to solve. I don't suppose that they have a mortgage to pay off so the expense is day-to-day operation. They seem incapable of reforming their theology. They need to rescind Trent.
I would guess that his pension and benefits are worth about 20 to 30 thousand a month. Certainly, that makes him about the highest paid retired clergyman in the world, but there may be a couple of clergymen with private wealth who have more.