Even though they have their own issues financially, I think that the Evil Empire (Ceasar's) has been the preeminent "data miner". This article is interesting from a business perspective but probably lends more credence to Richard Munchkin's opinion that you DON'T play with a player's card. Never realized that they tracked you in real time when you were on property.
http://www.forbes.com/sites/bernardm...aluable-asset/
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