Sorry I don't know the answer to your question, but just to clarify for the other scribes, are you talking about the expected wealth gain similar to that detailed in the DMG?
There is the standard wealth table in the DMG. It only goes up to 20th, but you can easily extrapolate from there. There is also the Epic Level Handbook, which should logically have a similar table or at the very least a simple formula to figure it out.