So I made this Enchanted sword that deals 81 Fire and 81 Shock damage (I have all the perks in Enchanting, Alchemy and most of Destruction). Wearing my usual gear to fortify Destruction by 100 I proceded to test out my new sword, it didn't use any charges now mater how many times I used it. I then tried out some other random Enchanted items and they didn't lose charges either (well the ones Enchanted with Destruction school spells). I'm on my moble right now so sorry about spelling, I'll fix it when I get home.

There's a tip that pops up on the loading screens saying how a mage with a high destruction will get a lot more uses out of a staff with a destruction spell than someone with low skill - Perhaps either through a bug or intentionally, this applies to enchanted weapons as well

That's what I was thinking, I hope it isn't a bug.

Nice to know about staves.

Sorry to sort of hi jack but do using a staff counts toward leveling up magic skills?