Loan Sharks are the seventh Cog of the Cashbot corporate ladder. Their levels range from seven to eleven. They appear only in buildings (3 or more stories tall), unless there is an invasion. They also appear in Cashbot Headquarters.
A Loan Shark is a moneylender who charges extremely high rates of interest, typically under illegal conditions. If the person does not pay back double the amount of money, the loaner will threaten and typically follow through with bodily harm.
Loan Shark is mentioned in one of the Megaphone puns. It isn't a reference, but it seems connected.
Loan Sharks are one of three cogs which can do attacks capable of dealing up to 24 damage.