There are quite a few words that can be insulting about someone who doesn't like to spend money.
A miser is
a mean grasping person; especially : one who is extremely stingy
with money
"stingy" is also kind of insulting, as it describes someone who is "not generous",
not liking or wanting to give or spend money
A scrooge is someone who is a miser and stingy:
her father is a real scrooge and refuses to pay her way through
college, even though he can easily afford it
This word comes from the Charles Dickens story A Christmas Carol - Ebenezer Scrooge is a rich but very mean man who makes his employees work long hours for little pay.
Here's a picture of someone in the role of Mr Scrooge:
A "tightwad" and a "cheapskate" are also people who don't like to spend money. These words are a bit less negative, though: the person may not like to share or help others, but they are not as mean as a miser or a scrooge.
"cheap" is another good word. It is also used for things of poor quality, so it suggests a person of low morals or class who is also stingy.
Informally: The "getaway driver" was part of the gang of robbers.
Formally: The "accomplice" "aided and abetted" the bank robbery.
"Getaway driver" refers to the exact role you asked about.
"Accomplice" is a more general term for someone who helps commit a crime. The help might be before, during, or after the crime itself.
Best Answer
Some might say "mascot." Another might say "in costume." And some might say "desperate."