Comment Seems to work for Restaurants (Score 2, Interesting) 133
In Vienna we have a pakistani Restaurant called the "Deewam", which is basically "eat as much as you want - pay as much as you want". Seems to work, it's well-frequented (mostly by students for obvious reasons) and it's been there for quite a few years.
Maybe it's because you have to pay an actual person and look him/her in the eye. As most people don't want to look like assholes, they pay adequate prices.