Know when to hold 'em

There is an expression in the states that it's important to know when to hold em and know when to fold em. This, of course, refers to the skill that a successful poker player has in knowing when to stay in or drop out of a hand.
We use it in all kinds of business and personal situations to describe the decisions to stay in the battle or drop out asnd fight another day. In a recent e-mail to my favorite Aussie blond, I used the expression without thinking. Is it used around the world?

Has Kenny Rogers been 'round the world?

"You got to know when to hold 'em; know when to fold 'em,
Know when to walk away; know when to run.
You never count your money when you're sittin' at the table.
There'll be time enough for countin' when the dealin's done."