Meaningful feedback resulting as motivation?

Finland is a country of self service. Where this is most imminent, is cafes and restaurants. Mostly, you need to get your orders yourself and even clean the table afterwards. In a bit better places you might get service, but often it's poor or unmotivated.

Despite few exceptions it seems that service is clearly better in cultures where waiters salary consists mostly of tips. For long I considered tip based salary somewhat bad deal, but I have changed my mind.

Compared to fixed salary, tip based salary creates immediate feedback channel between customer satisfaction and waiters behavior. Furthermore, the feedback is truly meaningful to the waiter. Skilled waiters can even make a career and climb up the ladder to better places with better tips.

The experience of the profession becomes this way totally different than in Finland, where common understanding is that anybody can be a waiter resulting in that nobody actually wants to do it nor be proud of ones profession.