I haven't seen it in over 35 years of racing but have heard stories .. I have had the opposite happen on a guaranteed pay out .. I was running 11.50 Index at a Labor Day weekend Index race at Numidia Dragway in Pa. a few years ago I got down to 4 cars and it rained out , Thinking I would get a hundred or two .. they paid out the full amount split between the four cars left ! $950 each ...at another Pa track a few years ago I Won the Trophy Class at a Mopar race resulting in Winning a Trophy , the track operator came up and gave me some cash also and said Thanks for coming !