I'd say only devalue it if you're going to allow two vaults. That way, it gives the girls an option to work a harder vault as a second vault, if they desire. Otherwise, keep it at a 10.0, but make the deductions a little more strict for steps, piking down, etc. Some girls are throwing 1 1/2's and taking a small step but get hammered just as much. Not quite fair.

"A Happy Person Is Not A Person In A Certain Set Of Circumstances, But Rather A Person With A Certain Set Of Attitudes." Hugh Downs