Even fictional post-scarcity utopias have crimes of passion. You cannot get anywhere near crime free without one of the following options: a) absolute coercion and perfect preemptive law enforcement, b) no laws to speak off (including no prohibitions against murder), c) radical departures from human nature as we know it.

That said, I agree with your broader point: sometimes it is worth it to be able to detect and stop crime based on its financial footprint, even if you don't gain economically from doing so.