There's no regulation that says who should be on your high risk list, period.
As has been noted here before by others, once you file a SAR you are going to be monitoring the customer for at least 90 days to see if the activity continues. One effect of being labeled "high risk" is that the customer is subjected to additional monitoring.
Automatically classifying a SAR suspect customer as "high risk" simply allows you to plug them into a already existing monitoring system.
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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.