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Didn't think of the family version. I was under the impression the question was about two types of commercial venture.
Whether it is commercial or for family parties it takes same procedure of paying first and then eating whatever you want with no limits. The thing is the party organiser pays the money at party buffets.
I do not see this system of taking first what you want and then paying for it. It is only for ice creams and yogurt stalls or eatouts that you take first and get it weighed and then pay for it. Not for other things.
Never heard of 'self-service'? It's what cafeterias are based on in many supermarkets or workplaces, and has taken on massively across most of Europe and the English-speaking world in the catering trade.
I know self service. But it is only on paying cash and taking the token relevant to the item. That is what I experienced.
Sounds labour-intensive. Is that the norm in India? In most places it's self-help first, then pay cash at the desk and away you go to your table. (Cuts out the need to produce and distribute tokens)