Back in the day with DMM 1st generation Predators we broke 2 picks in 2 hours on the Plum. They were Guy's old mixed picks he had traded to Vance though - not fresh ones.
I've seen 2 parties break BD picks cragging near me in the Rockies (Heart Cr. and Johnson Canyon) and one party break a BD pick at Rambles. dates of these breaks would have been pre-2001.
I finally managed to break the tip of a Quark pick earlier this winter by filing down a tooth too skinny (cheap) then pounding it into a buried rock under a coating of fluff with a full overhand swing - AFTER mixed& alpine climbing c. 3000m with it over the last few seasons. It broke off about 3mm from the end and left a flat front that I filed down and climbed more on.. Time for a new one, at $50 each they have to last.