Ira Glass on a age guessing game at a park run by someone named Sarah:"

Later, Sarah privately confirmed for me that she did intentionally take a dive. Which is fine with Cole, because it turns out, it doesn't matter if the kids guess right. The game costs $5 to play. The prizes cost less than $5. Sarah can be wrong with every single guess, and they'd still make a nice profit. In fact, it's good to lose, because people carrying prizes around the park are a walking advertisement for all the games."

https://m.thisamericanlife.org/radio-archives/episode/443/tr...