How we cite our quotes: (Chapter.Paragraph)
Quote #1
"The Continental's got rules against taking bonuses or rewards," I said. (7.78)
The Op's professional code of ethics forbids him from accepting money as a bonus or reward. We can see here that the Op adheres to his own set of rules, even when there's no one around to keep him accountable.
Quote #2
"You haven't forgotten that your check was to cover the cost of investigating crime and corruption in Personville, have you? […] I'll give you nothing except a good job of city-cleaning. That's what you bargained for, and that's what you're going to get." (7.81)
The Op promises that he'll give Elihu his money's worth and bring back a cleaned-up Personville. The Op isn't someone who can be bought with money. In particular, he takes pride performing his job well.
Quote #3
"I can give you the stuff, brother, loads of if, and don't think I can't. I'm a girl who knows her Poisonville." (10.83)
Dinah may be the only major female character in the novel, but she's not too lady-like to participate in some of the money grubbing either. When she sees that the Op is serious about his mission to cleanse, she hopes to cash in on her knowledge about the class workers.