So currently there are a lot of mini Mandarin oranges at various grocery stores as a result of Chinese New Years coming out. I was walking by one place that was giving away free samples. As you can see, essentially they just dumped a bunch of oranges on the table and people can take as many as they want.
The interesting thing in these cases was that it seemed like everyone knew better than to hoard it and at the same time people were actually buying the oranges as a result of the samples. So it was definitely working for them from a business point of view. Kind of makes you wonder why in this case people are willing to think of others and not try to take everything for themselves whereas in like a convention people would take as much as they can without thinking twice.