My husband collected the Millennium Village pins, but when we bought them at WDW in 2000 they were missing 3 of the pins. It took until late last year to get them all. We were missing Venezuela, South Korea and Greece. It seemed like no one had them. I looked at the NFFC show & sale and saw very few flags at all. A friend found one of them for me and we ended up buying the last 2 on ebay from a seller in the UK. We were able to buy them for about $5 each which was cheap, but they were little devils to find in the first place.
I don't think there was a lot of interest in these pins, and so not very many people bought them for traders. But there is SO little interest that they don't sell for much either I guess.