"The real cost" versus the real economic benefit.  

I'm not going to argue the numbers at your posted site. I will point out that, almost item to item, the "most expensive illegal immigrant states' are the most productive gdp economic states. There are factors working in those states that do not operate at the bottom of the productivity states.

People move to those states to participate in the economic activity? Or to avoid the stagnation of the lesser active gdp states? From personal observation, I'll estimate the my home state, Georgia is high on the lists of economic activity because we have a diverse population in the economy. Little Mexico, Little Honduras,Little China, Little india/Begali neighborhoods.

When I have the time, I like to go to one of our international markets in Decatur, Buford Highway. You can buy almost any food-stuff you can imagine at those stores amidst peoples from everywhere.