Frighteningly enough, that IS illegal. Making multiple transactions at below the mandatory reporting level is enough for the IRS to seize your money in the "belief" that your were attempting to dodge the reporting requirements. They call it "structuring" Some links:
"People who are regular buyers of whisky are complete snobs about it."
That's really not fair, some whiskey drinkers aren't even aware that bourbon is the most superior form of whiskies. Some even CHOOSE to drink Canadian Mist or even Beam's Eight Star, which are the voluntary waterboarding of whiskey drinking.
I really don't think Nintendo should be the company to use as an example. They are notorious for losing their shit over ANYTHING. Nintendo is the worst company in the industry when it comes to copyright maximalism.
(They're not the worst company all around though, they at least make good games that you can buy once instead of getting fucked with "DLC")