A shame the budgets became too much for both the NBC and syndicated version Sale to handle, hence why they changed endgames. The shopping format will always be the best. The other two had absolutely nothing to do with the game.
Reminds me of another Reg Grundy show that sort of went the same way in Scrabble. Originally, the highest anyone could win was $55,500. Then it was changed to $40,000 in 1985. Finally, in 1986, when the bonus sprint was adopted, the money for winning the sprint round was $1,000 instead of $1,500, and the jackpot started at $5,000 (+$1,000 if it was not claimed). The minimum average amount of money a contestant could win under the 1986-1990 format was $47,500 (three $1,000 bonuses for guessing the word on the pink square, + $500 for winning the front game + $1,000 for winning the sprint round + $5,000 for winning the Bonus Sprint, wash, rinse and repeat for the next 4 days).
However, even with that said, while Sale's format got worse, I think Scrabble's format got better. But that's another story.