The Diamond King may win, or the Club Jack could promote. A one bid is just too conservative. A lot of players really believe in this strategy. The idea is to underbid your hand and intentionally sacrifice sure or expected tricks in order to force the opposition to win unexpected middle or lower card tricks. While this idea does have some merit, it has the inherent flaw of throwing away ten points for each underbid trick.
Some players go to extremes and play the bagging game at the beginning of a match.