LAST EDITED ON 12-09-09 AT 11:44 AM (EST)
I assume so but didn't see a pay out table on a quick google.
Pretty much every show has to pay you something, and either it is a so much per week you were on the show as some sort of stipend or they do a by place.
I'm not sure what the legalities would be of paying everyone nothing other than the winner. I think they usually have to pay you something as they are making money off the show so it only seems fair.
ETA: http://answers.yahoo.com/question/index?qid=20090226051618AAc3jgq says one of the former contestants from a previous season seemed to indicate you got paid by the week. So every week away from home you get a stipend.