RANGE OF INTERESTS: Well, changing the PayPal button to let people pick the amount clearly unlocked untapped demand. It used to just take donations in the amount of $2.50 — somehow I set it up that way and never got around to changing it. (This site, unlike, say, Andrew Sullivan’s or Bill Quick’s, isn’t set up to be revenue-maximizing). But I got several emails close together asking me to change it to let the user choose the amount, and lo-and-behold, people responded with donations ranging from $75.00 to one cent. Yes, one cent. As an economist would say, it’s a diverse mix of preferences.