A question for the data-mining maestros
Sucked in by an Organizing for America pitch for health care reform, I tripped over what seems to be a trick of fundraising art:
Amount
$25 $100 $500 $2,500 $50 $220 $1,000 Other: (USD) Credit Card
Why do the options bump from 25-50-100 to 220? What byte of microtargeting data is at work there? Did donor patterns indicate that for people donating $100, going up another $20 or $10 might be a psychological barrier, whereas for people at the $200 level a 10% bump-up triggers no hesitation? Does this bring in an extra 3% or 5%? How prevalent is this trick? Is there some accepted wisdom that you can slip one bump-up in the menu but not more?