I assume the order came from a high risk country? I've seen some high scores that ended up being legit but those are usually because the order comes from a high risk country (in which case we still ask for supporting documents).

If the person entered their details correctly, it shouldn't be high at all. The score only goes up to 10, after all.

http://www.maxmind.com/app/ccfd_formula

To each his own I guess. Everyone has to figure out their own process of filtering orders.