It's really all about how you describe the service. Tipjoy is all about dead-simple voluntary patronage of digital content. Patronage is a millennia old model for creative content generation.

Also, tipping isn't anonymous. Here is a list of things I've tipped. http://tipjoy.com/userstream/ivankirigin/

We're going to push this information as far as we can because the social side is so important.