Interesting topic.
-TEMPTATION: If I'm not confident about the last digit, I'll probably take the prizes and bail...there's always eBay. :-)
-SPELLING BEE: If I don't have at least 2 of the letters by my 3rd pick, I'll walk with $1,000.
-PASS THE BUCK: If I get down to my last pick and have some money, I'm walking.
-LET EM ROLL: Probably take the money before the last roll, esp. if I have 2 or more dice on the table.
-PUNCHBOARD: $1,000 or more and I'd walk...however, if you get the $1,000+Second Chance, can you still keep the $1,000 and whatever's pulled from the Second Chance, or do you forfeit the $1,000?
GRAND GAME is probably one of the few where I'd go for broke.
-IT'S IN THE BAG: Most likely $4,000, but $2,000 if I'm just not confident.