It's a bit of a dilemma: One of the qualities that is desirable, is a bit of fearlessness. OTOH, is it often fearlessness, that makes a vaulter invert on the really bad plant and take-off. It's a delicate balance.
I've posted a question on a danish board, on whether a referee could disallow a vaulter, if he/she feels the vaulter is a danger to himself (and the sport). I've had experiences, that almost warranted a change of batteries in the pacemaker
