uThat rule is only in your imaginación, the same than the whole "permanent-tourist" self lie: it is illegal immigration.
Something called "pacífic precedents of Supreme Court since 1828" says that if you are in Argentina and your will is to live here, you have the right to stay, leave and enter the country". The 2000 stamps in your passport is against the rules that protects you according to the laws of THIS country.
But the trips to Uruguay are kinda needed to get dollars. And we all know Argentina likes the dollars, even if the amount from all the expat types of whatever residency status is really only a small drop in a very big bucket.
Of course I guess Argentina likes it better if you don't make the trip and just use the official rates too ...........