$100 now is worth strictly more than $100 later, because now I can do a strict superset of what I can do with it later (namely, spend it on anything between now and then), as well as hold on to it and turn it into $100 later.

There could be Schellingesque reasons to wish to lack money during a certain time. For example, suppose you can have a debt forgiven iff you can prove that you have no money at a certain time; then you don't want to have money at that time, but you would still benefit from acquiring the money later.