Mysterious queue

Coming out of my home subway station I was surprised today (Sunday) by a long queue of young people. Disciplined as queing here in South Korea is usual. Between one and twohundred people standing on the pavement in rows of two. I checked the beginning of the road, which turned out to be a small shop whith posters in the shop window, announcing a flea market. Through the door I could see people checking clothing. As this shop is quite small, I wonder that even the people from the middle of the long queue would even find unsold items.