No such thing as stupid questions

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The original was posted on /r/nostupidquestions by /u/Sobbin on 2023-09-18 12:46:17.

The other day I stayed in a hotel with friends. We had the hotel breakfast buffet. To my big suprise, half way through the meal they pulled out tupperware boxes and started making lunch. I was completely surprised. Yes, the buffet was expensive, but this felt like 'cheating' to me. What is the etiquette here? Is this a normal thing to do?