File this under “Gains from Exchange”

Police officers in Seattle, Washington held their first gun buyback program in 20 years this weekend, underneath interstate 5, and soon found that private gun collectors were working the large crowd as little makeshift gun shows began dotting the parking lot and sidewalks. Some even had “cash for guns” signs prominently displayed.
Police stood in awe as gun enthusiasts and collectors waved wads of cash for the guns being held by those standing in line for the buyback program.

This is from Ed Brown, “Seattle Gun BuyBack Gets JACKED!” January 27, 2013.

Further excerpt:

But the BuyBack wasn’t a bust. On the contrary – their $80,000 supply of gift cards didn’t last but 2 hours, and by 11:00 am they began attempting to issue IOU’s at which point the entire crowd responded by turning and marching toward the gun dealers, forcing the police officers to pack it up for the day.

HT to Instapundit.