Tickets home courtesy of Homeland Security?

This article discusses the decision of returning home that some Argentines living illegally in this country are making. What is most interesting is the brief mention made regarding those that purposely use the deportation process as an inexpensive way back home (flights to Buenos Aires probably average 5 or 6 hundred each way with seasonal variations). The article doesn't elaborate much on this point. I am guessing this occurs mostly with Mexican migrants. If anyone knows more about this loophole of sorts, let me know.