Leaving a "Cold Table"

Many blackjack books tell players to get up and leave a blackjack table if too many hands in a row are lost, and/or if the dealer just can't seem to lose. Since how the cards fall is a random event, I don't get the reasoning on this concept. What difference can it make to get up and go to a different table?

Other than for reasons like frustration, you don't like the dealer, rude fellow players, or elimination of your bankroll.....is there ever a reason to leave one table and go to another one?