The Informants Salary
You can make a good living while being an FBI informant! Special Agents are able to pay up to $100k each year. If the informant actually gets the approval of the FBI, they could get up to $500k a year.
The informants can get expense reimbursements and payments for their services. You would think that most people would want to just get a payment, but a lot of people actually take the reimbursements... It's way safer that way.