Many buffets have lots of "stations" which (sort of) prepare food to order (1)omelets, (2)crepes, (3)sushi, (4)Mongolian etc. Caesars Palace in Las Vegas closed their Lago buffet and opened the Bacchanal buffet (dinner is now $40)--and if you follow the "rules" (per various publications), if you utilize (say) 5 "stations", you are supposed to leave (at least) $1 per each, this becomes a (very) expensive buffet.
Do "you" tip per "station"?
Sorry but i only tip the waitress at a buffet ... If no one tips the stations then indeed no one will want to work that job and eventually they will pay the employee the right amount(Supply and demand).