Look what I’ve found. I found this interesting to read.
Blizzard added a lot of items into World of Warcraft. Inferred from Items’ ID, I think there are more than one hundred thousand items in the game. However, as players, we can only use around two hundred items in the usual. Besides, not all items are provided for players. Some were added into the game as debugging tools. Some are out of print, like totems. And some are just for fun. Although these items can be acquired now, they were legal to be acquired before.