And just for extra incentive, with only 3 models & the rest civilians, why not offer a guessing game like tha Austraillian version for, say $1,000? I wouldn't mind seeing that.
As for 5th Grader?, it might work as a strip except do the ladder like this:
$50,000**
$25,000
$10,000
$7,500
$5,000
$2,500*
$1,000
$750
$500
$250
*milestone marker
**11th question = double the 10th question or $100,000
As for Po10, simply dividing everything by 10 from the prime time version works for me. Not sure if Sony's willing to pick up another one besides WoF & J!