We've seen it on several ships. On Prima camping out very common in buffet, indulge, observation lounge. Lounge people shoes off, feet up, sleeping. Indulge seating limited so people grab what they can find after wait. Couple of two taking up a six place booth spread out not even maybe move to one side leave other open, saw that more than once. Poor staff try to help walking you through the area with no seats. The campers usually reading books sipping water or iced tea.