The core of this is anti money laundering and that, in many cases, is not victimless. You also point out that they have limited resources, but try to roll into an argument about how trying to preserve those resources is pointless?

Also, law enforcement isn't exactly a "massive resource" spend when the cost of that should already be baked into yearly country expenses. The only real expenditure is time for investigation. If this really is tied into luxury construction money laundering, we could he talking about hundreds of millions of dollars saved or recovered by only paying the salaries of a few law enforcement officers that will need to work anyway.