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"?
I've never heard that, I've never seen a tip jar at the station, and I don't see how your server would be able to keep track of how many stations you use.
On top of a $40 buffet, an extra $5 in "station" tips would still put you under the regular sit-down restaurant tip,absent some other tip to the server who brings drinks. I'm sure the same publications suggest tipping the buffet server as if they were a regular restaurant server; I've already given my opinion of that.