On sea day during our cruise in Alaska we went down to Cadillac Lounge in the middle of the day and brought a card game with us to pass the time. We didn't order any drinks, the server came over once to ask us if we wanted anything and we said we were good for now. That was it. No one bothered us, no one came over to ask us to buy a drink, no one else was even in there! It was a great quiet place to enjoy the scenery outside the portholes and relax. Coming from a "land" perspective it would feel VERY weird to walk into a "lounge" hang out and not buy anything. On the cruise it felt weird at first, but we just thought of all the spaces as "public use" with a bar attached for convience and it made it easier for us to make that mental switch. The Disney Wonder staff however never made us feel awkward or like we had to purchase a drink.