This is incorrect, and you're unintentionally spreading misinformation. California law specifically uses the term "grey market" and manufacturers do not have to honor warranties of products purchases through unauthorized channels as long as it is disclosed to the consumer. See the actual text of the law: http://leginfo.legislature.ca.gov/faces/codes_displayText.xh....
>The term "unauthorized dealer" is another word to stop using.
I think you're too focused on words instead of the underlying behavior. Even if we outlawed the phrase "unauthorized", you still have the reality of manufacturers refusing to enter wholesaler contracts with any dealer. You'd still need an alternative word to describe a dealer that sells products without a contract to purchase directly from the manufacturer. Whether we use a cumbersome multi-hyphenated phrase or come up with alternative jargon to avoid the word "unauthorized" ... the reality still remains that manufacturers will not enter into buy/sell contracts with every dealer.
Some savvy and sophisticated consumers will want to know if dealer X doesn't have a direct relationship with the manufacturer as part of the purchasing decision. You don't like the word "unauthorized". Ok, that's fine. But what alternative label do you propose for that non-existent relationship?