Spelling Bee - The walk away mechanic should escalate. Almost no one takes the money on the fifth card if they've flipped 4 already because they're already so deep. If the walk away grew, then it could make the end of the game more interesting. When they play the game for cash, it would make a world of difference because no one is taking $1000 (5 cards for guaranteed $5000, or risk it for $25000).
Instead of $1000 printed on the back of the cards, escalating amounts would be on the holding slots ($1000-$5000). Walk away before the first card is revealed, you get $1000 and so on. So if they get 3 cards, they could walk away with up to $3000, but they at least have to play the first two cards. And if they got an R (or N in W-I-N), then they have a more meaningful choice before deciding to flip the last card.