I did live in a sun city that people came to from all over the US with too little money or too little something or other, some of whom became homeless - the home of the homeless, Los Angeles. There's a recent New Yorker article about folks on Skid Row being in a movie based on a book by LA Times writer, Steve Lopez (a columnist I like) and Nathaniel Ayers, a fellow who left Juilliard with schizophrenia, eventually ending up on skid row, presently 57 years old. Interesting tale indeed. Anyway, the director insisted on many of the actors being skid row folk.
This is the abstract - the article itself may be available in a week or so:
http://www.newyorker.com/reporting/2008/05/05/080505fa_fact_goodyear
Back in the eighties, the LA Herald Examiner did a big series of articles interviewing the homeless, and a then startling to me large majority of them were from elsewhere, often far elsewhere. But then so were a lot of other Californians at that time.
My father could have landed on skid row. He had a sad enough death as it was. A friend's father did live there. Much bittersweet.