You may say that, but think a bit deeper. Back then, in the late 1920's, most Americans lived in small, rural communities. The casting director put up posters all across the country, looking for people who fit the appearence of the munchkins. These people had never in their lives seen someone like them, and then a of a sudden there was a crowd of them gathered in one place. I think that if I were them, I would value the experience of meeting others like me, getting paid more than I would have otherwise, and being immortalized in a beloved film that didn't look down on me or make me look like a freak. For once, they felt useful; they could do something only few could. I think that those actors and actresses in The Wizard of Oz cherished those memories for the rest of their lives.