So here's what's interesting. It took $760 to win All the Things and $650 to win just the money. Barbara Phillips won with a total of $764, so by virtue of passing on the car and playing the next game she had enough in the bank to win the jackpot with the twenty bucks contestants started with.
I think that most contestants liked the idea of winning a massive amount of money, and in all likelihood passed on more of those major prizes than they accepted, other than the trip and car. I also think that viewers were more interested in that amount of money more than the smaller prizes unless it was something wacky like the Laserdisc player or that mini-Lamborghini that was in the first bit of the second season. I can see why the last two steps were ordered that way and I can further see why they'd go to the winners bored so soon.