I have heard Samuel L. Jackson's reading of Go the F@@k to Sleep, and it's hilarious. Would I read it to my kids? F@@k, no! Nor would I recommend anyone else do so.
But it's fun for grownups, especially those who have had to deal with a kid who won't go the f@@k to sleep, when the grownups in question would like to have some grown-up time together, whether to watch a movie, talk about something other than Elmo or Mario, or maybe even try to make another kid who won't go the f@@k to sleep.
All I can say is, I wish I'd thought of it. The writer probably is making a ton of money, and Samuel-L.-f@@king-Jackson read his work. How cool is that?