The Wow mouse is made by Steelseries. It is Steelseries who pay all of the development costs for making this mouse. All Blizzard does is agrees to have the Wow logo on the mouse. They both then split the profits.
i could use the same explanation for all the other MERCHANDISE that u listed.
Basically speaking these 3 helms were created by the Wow dev team, a dev team which is being paid by everyone who pays a subscription to Wow. Everything u listed is not created by the Wow dev team, and that means theyre not being paid by the subscribers.
Benbos, we all know ur extremely good at not understanding anything on these forums but this mistake is just hilarious.