By blocking the hotlink and posting a link to their full site instead they get even better advertising.

Edit:
The actual link is not blocked, it works just fine.
It was the image that was blocked.
They want you to visit their site.
(not a bad site either)
So all they are doing is posting a statement with their website address on it.
It does seem a bit counter productive not to put a working link onto the image link unto it instead of just an image telling you to visit them.

Now I will go back and look at their mini-mirrors to see what the actual post is about.

Edit 2:
Nice site with some interesting stuff.
Not the kind of stuff I am likely to buy, but still interesting stuff.

About the mirrors.
I wonder if they are large enough to be effective.
I have a couple of the star flash and a couple of the small glass ones hiding in different packs and I wonder if even they are really big enough.

So I would not likely add a piece of jewelry as a mirror, but if you wear that kind of stuff or need more stuff on your keychain I say go for it.
I bet they would make nice zipper pulls