This is no Exploit or anything, but since Enchantments drop like crazy you will find this quiet usefull.
If you put an Enchatment in a Socket the removal costs allways a lot of AD, the higher the more AD you'll need to remove it.
If you dont need that Enchantment and you have plenty of them you can easily overwrite the Old with a new one just by Drag and Drop the new Enchantment
from your Bag over the Existing inside your Item.
-Hank