I don't think people are injecting their own norms on this game in so far as Quinn's activities are nefarious.
Simply by the way Lily frames it when confronting Quinn:
Lily: "Prostitution, drug peddling and blackmailing. Aren't you a treat?"
Quinn: "Aren't you an eavesdropper?"
I don't think there's any doubt that what Quinn dabbles in is illegal. The extremely coy way Quinn and Lily skirt around starting their business relationship shows both are being careful.
If it's all legal and legit where you come from, you may find it's your cultural bias that's interfering with how you see it.
Sex on the third date? Every dude ever has been trying to convince their girl that that's the norm.