Because the more self-referential a Joke is, The funnier it is.

How many bloggers does it take to change a light bulb? 37 One to actually change the bulb and then blog about how it made them think about the effects of technology in our world, 11 to write 800 word responses to the blogger which a good editor would have boiled down to "Me,too." and 25 responders to write "You Suck"