"Don't forget that the very act of loading/unloading that mag would have weakened it."
But that's what happens when you shoot up the magazine and reload it and shoot it again and....you get the idea.
"You'll wear out b4 your glock mags do."
Hopefully not. You can buy rebuild kits for Glock magazines. New springs in an old magazine makes it work like new. Unfortunately there's no rebuild kit for me.