^^ if I'm buying used stuff now I tend to look for the AppleCare. One, because then I know it's registered with Apple and it's legit and two, I can get things replaced under the warranty and have a basically like new device for the price of a used oneI buy it for two reasons, first for the protection (cracked the edge of the screen on my 3, replaced with absolutely no hassle.
Second, I have sold my watch 2,3 and now 4 to some of my colleagues at work. In every case, the Apple care gave the new owner around a year of warranty. That’s reassuring to both the buyer and me. For them, they know that they have a warranty, for me it takes me out of the equation should a problem occur. I would really hate to have the buyer/ friend have a problem soon after purchasing the watch and not have any protection.