I'd guess that every financial transaction over about $5,000 is recorded and monitored these days - in the name of "security".
Other than physical cash I don't know how you would pay for something and NOT have a high probablility of the transaction getting reported to some level(s) of fed/state/local government.
Drawing 10, 15, 20 or 25K out as cash or a cashier's check would be "unusual" for many folk - I suspect that unclosed loops arouse suspicion and cause followup, e.g. if it doesn't get deposited at somewhere like a car dealership within a week.
I don't know what the dealership reporting requirements are.
Even cashier's checks and money orders aren't totally anonymous.
Just opinion - I'm not a conspiracy theorist and I'm not at all sure that we're living in an Orwellian world - yet.
Well, not quite.
(-:
So,
PAY YER TAXES LIKE THE REST OF US DO AND STOP BEING A LEACH !!!
(-: