When Batman stumbles on a $500 bill for the bat cave, he questions Alfred about the expense.

Leave the old valet alone, Batman! At that age, he shouldn’t have to vacuum the Batcave for you! Pick up your own stuff! And $500 are pennies for Bruce Wayne, especially when the man spends millions of dollars on gadgets. I mean, 92 millions for boots with ice skates? How useful could these be?

[Source: Texts form Superheroes]