I was wondering about the whole free thing... Then...
http://tunlr.net/forums/topic/donations/We don’t take donations because this is a fun project. It’s a great learning experience in many ways. Taking donations would make us feel obliged to run the service. People would come up and say “damn I just donated and now they dropped support for zombieapocalypselive.com, I want my money back”. It would most definitely lessen the fun. We’re kind of our own angel investors.
Still. Sounds pretty good.