FM also made a pretty set of 25 "Worlds Great Casinos" in silver. Originally sold for $875 in 1978. One recently resold on eBay at $631.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1077956365

These FM sets are interesting to view (I don't have any), but they do seem to follow the adage that anything that's expressly made to be a collectible doesn't often appreciate in value in comparison to ordinary items that become collectible later on.