If you read and re-read the FinCEN guidance until your eyes blur it will be apparent that they really want you to ignore the dollar thresholds for reporting computer intrusions and e-mail fraud. Certainly, neither the FBI nor the Secret Service is going to pursue a $4,000 attempt or even a $24,500 attempt. However it's the cumulative data value that many reports have; e.g. this attacker's IP address was contained in 27 different SARs filed in a 30 day period. That might be worth pursuing...
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.