You should make sure to distinguish in the poll if the income in question is net income, or disposable income.
Net income refers to all the money you make, disposable refers to all the 'play money' you have (after bills, payments, et cetera). I'm sure the numbers would be more accurate that way. I think alot of these 100%ers (anything over 20% probably) are referring to disposable income, and alot of teenages and students and the like already live with their parents or a dorm or something of the sort.
That way you could compare the young kids out there who live with their parents and work at a local restaurant, with the older folks with a 9-5.
With that said, my disposable income is probably around 30-50% I'd guess. The rest goes to gasoline, food, and stocks/savings.