True, but if it's an addon product for an item that is no longer available, once the base item goes away, some note of it should be made on the addon items page denoting that it can't be used unless such and such is owned etc...if I'm not mistaken other places do this, and in fact I thought Rendo did as well. I know the MP here used to tell ya that a,b,c was needed when buying an addon product.

 

"The Blood is the life!"