We're not talking about terrorists or Nazis here. Do you really think we'd be sending Seal Team Six to get some guy who scammed the lottery? He didn't even catch federal charges.
If you aren't a threat to lives on american soil, there is no amount of financial crime that will earn you extraordinary rendition. It isn't worth the diplomatic relations, nor the risk of life for the people who would be grabbing you.
I seem to remember Brandon Webb's book "the red circle" where he relates FBI agents were attached to seal teams to do forensics in theater after operations.
They investigate crimes overseas all the time. They investigated that situation where three US special forces guys were shot by a Jordanian military police for example.