Assuming the trip to Greece was a joke was pretty good, as was the comment about hearing other people’s hobbies and just thinking about the expense. There are definitely cultural signifiers from wealth. Discussing housing endlessly is the biggest one.
Are indoor rock climbing and adult soccer known to be especially expensive activities? I haven't done much indoor rock climbing, but I've done a lot of adult soccer, mostly for free.
The fancier soccer fields with lights on cost 25€/hour, divided by 22 players it becomes just 1€ each ( and you still need to bring your ball )