When building sets, I buy lots/part sets of cards for the year I am working on. I have come across a fair number of 64 Floods in these lots and have sold them off on ebay. Over the past 2 years I have sold 11 different 1964 Floods that I have received in these various lots. For me, 6 of the 11 I sold were to the same buyer. In flipping through his feedback, he appears to be the person buying as many copies of this card as possible.
http://feedback.ebay.com/ws/eBayISAP...:X:AAQ:US:1183