A couple of problems with this:
1) the "average all-American"... is a citizen as opposed to an ILLEGAL. While I personally would do away with social services for all people, Illegals should never get a dime of my tax money.
Although the United States’ welfare rolls are already swollen, every year we import more people who wind up on public assistance: immigrants. Many immigrants are poor; indeed, that is why they come here. The immigrants we admit are much poorer than the native population and are increasing the size of our impoverished population. As a result, the share of immigrant households below the poverty line (18 percent) is much higher than the share of native households that are poor (11 percent)—nearly twice as high. And immigrant households are more likely to participate in practically every one of the major means-tested programs. Immigrant use of welfare programs (21 percent) is 43 percent higher than non-immigrants’ use (15 percent).1
Each year, state governments spend an estimated $11 billion to $22 billion to provide welfare to immigrants.2
I put a very rough price tag on the farmer, by the way.
The farm bill that was passed last year allocates $183 billion for agricultural purposes over the next six years. This comes to about $30.5 billion per year. I've estimated current farm employment in the U.S. at about 2.5 million (based on late USDA numbers from the late 1990s), which computes to about $12,200 per agriculture sector employee per year. At $73,200 for the six-year life of the farm bill, I would say the Mexican who "costs" $55,000+ for his entire life actually comes pretty cheap.
I'd also point out that the numbers I referenced in the article are for Mexican immigrants in general -- I don't think they separate them into legal and illegal immigrants.