Why is vladek so concerned with money?

During the war money was the reason him and his wife survived.  He saves everything because one may never know when or where they might use it.  Vladek is use to being the one in control, he doesn’t want to rely on anyone else and become himself no longer of use.

Hope this helps!

must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"