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I usually avoid real fraud, but if it makes it's way past all of the filters then I can usually spot it. No automation (yet) can beat human eyes watching the store.
In those cases I close the account, block the IP's, blacklist the card, blacklist the IP (server-side) and store an off-site record of the occurrence in the event that the scammer tries to come back with a different card, IP, etc.
But as JesseQuinn mentioned, I also do not file rebuttals from actual fraud. Just refund it if I catch it early enough or take it on the chin if it becomes a chargeback.
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