CSI: Miami had an episode around this topic. The Dead Pool was for big money and a young starlet got murdered. So naturally there was motive - someone was going to get rich.

I find the whole premise a bit morbid. Don't we have better things to do with our time?....bring bologna sandwiches to homeless people?....but I don't care how a man makes a living, as long as his interests don't conflict with my interests.