That airplane terminal mall is always pretty crowded with people. I think that's where many of them end up.
I don't see many people actually buying things in the shops in there though, which always seem to be devoid of customers with just staff in there waiting. It's more like people are just floating around the hallways looking at the country themes on the various levels. Similar to Las Vegas where everyone walks up and down the strip looking at things, but few people actually gamble in the casino's.