D&D 5E Has anyone experimented with Advantage / Disadvantage on damage dice?

[Blue]

This is what I use for masterwork or shoddy equipment. Something like:
Rusty Shortsword: 2d6(w)
Masterwork Handaxe: 2d6(b)
(b) is ''the best of the two d6 rolled, (w) is the worst of the two.

I like this, but I'm too much in the old mindset that any magic weapon would have to be of masterwork quality to be enchanted, and I don't want to give this to all magic weapons.