I'm logged onto FR about 13 hours a day. Not here most of that time, but I keep the window open and check for the latest news about once an hour if I can, and certainly at lunch if I'm eating at the desk.
I just calculated what it costs me per minute to be a Dollar a Day donor.
$0.0012644889357218124341412012644889 per minute.
Sure, sounds easy, but $0.0012644889357218124341412012644889 here, $0.0012644889357218124341412012644889 there, and pretty soon you're up to, like, a dollar.